Faculty Profiles - SUGIYAMA, Naoshi

Papers - SUGIYAMA, Naoshi

Division display >> ／ All the affair displays 1 - 94 of about 94

Weak lensing measurement of filamentary structure with the SDSS BOSS and Subaru Hyper Suprime-Cam data Open Access

Kondo Hiroto, Miyatake Hironao, Shirasaki Masato, Sugiyama Naoshi, Nishizawa Atsushi J.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Vol. 495 ( 4 ) page： 3695 - 3704 2020.7

Second data release of the Hyper Suprime-Cam Subaru Strategic Program Open Access

Aihara Hiroaki, AlSayyad Yusra, Ando Makoto, Armstrong Robert, Bosch James, Egami Eiichi, Furusawa Hisanori, Furusawa Junko, Goulding Andy, Harikane Yuichi, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Song, Ikeda Hiroyuki, Imanishi Masatoshi, Ito Kei, Iwata Ikuru, Jaelani Anton T., Kakuma Ryota, Kawana Kojiro, Kikuta Satoshi, Kobayashi Umi, Koike Michitaro, Komiyama Yutaka, Li Xiangchong, Liang Yongming, Lin Yen-Ting, Luo Wentao, Lupton Robert, Lust Nate B., MacArthur Lauren A., Matsuoka Yoshiki, Mineo Sogo, Miyatake Hironao, Miyazaki Satoshi, More Surhud, Murata Ryoma, Namiki Shigeru V, Nishizawa Atsushi J., Oguri Masamune, Okabe Nobuhiro, Okamoto Sakurako, Okura Yuki, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Osato Ken, Ouchi Masami, Shibuya Takatoshi, Strauss Michael A., Sugiyama Naoshi, Suto Yasushi, Takada Masahiro, Takagi Yuhei, Takata Tadafumi, Takita Satoshi, Tanaka Masayuki, Terai Tsuyoshi, Toba Yoshiki, Uchiyama Hisakazu, Utsumi Yousuke, Wang Shiang-Yu, Wang Wenting, Yamada Yoshihiko

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 71 ( 6 ) 2019.12

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 <= z <= 7.0 Open Access

Matsuoka Yoshiki, Iwasawa Kazushi, Onoue Masafusa, Kashikawa Nobunari, Strauss Michael A., Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Koyama Shuhei, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

ASTROPHYSICAL JOURNAL Vol. 883 ( 2 ) 2019.10

Planck 2015 constraints on spatially-flat dynamical dark energy models

Ooba Junpei, Ratra Bharat, Sugiyama Naoshi

ASTROPHYSICS AND SPACE SCIENCE Vol. 364 ( 10 ) 2019.10

Space gravitational-wave antennas DECIGO and B-DECIGO Open Access

Kawamura Seiji, Nakamura Takashi, Ando Masaki, Seto Naoki, Akutsu Tomotada, Funaki Ikkoh, Ioka Kunihito, Kanda Nobuyuki, Kawano Isao, Musha Mitsuru, Nakazawa Kazuhiro, Sato Shuichi, Takashima Takeshi, Tanaka Takahiro, Tsubono Kimio, Yokoyama Jun'ichi, Agatsuma Kazuhiro, Aoyanagi Koh-suke, Arai Koji, Araya Akito, Aritomi Naoki, Asada Hideki, Aso Yoichi, Chen Dan, Chiba Takeshi, Ebisuzaki Toshikazu, Eguchi Satoshi, Ejiri Yumiko, Enoki Motohiro, Eriguchi Yoshiharu, Fujimoto Masa-Katsu, Fujita Ryuichi, Fukushima Mitsuhiro, Futamase Toshifumi, Gondo Rina, Harada Tomohiro, Hashimoto Tatsuaki, Hayama Kazuhiro, Hikida Wataru, Himemoto Yoshiaki, Hirabayashi Hisashi, Hiramatsu Takashi, Hong Feng-Lei, Horisawa Hideyuki, Hosokawa Mizuhiko, Ichiki Kiyotomo, Ikegami Takeshi, Inoue Kaiki T., Ishihara Hideki, Ishikawa Takehiko, Ishizaki Hideharu, Ito Hiroyuki, Itoh Yousuke, Izumi Kiwamu, Kanemura Shinya, Kawashima Nobuki, Kawazoe Fumiko, Kishimoto Naoko, Kiuchi Kenta, Kobayashi Shiho, Kohri Kazunori, Koizumi Hiroyuki, Kojima Yasufumi, Kokeyama Keiko, Kokuyama Wataru, Kotake Kei, Kozai Yoshihide, Kunimori Hiroo, Kuninaka Hitoshi, Kuroda Kazuaki, Kuroyanagi Sachiko, Maeda Kei-ichi, Matsuhara Hideo, Matsumoto Nobuyuki, Michimura Yuta, Miyakawa Osamu, Miyamoto Umpei, Miyoki Shinji, Morimoto Mutsuko Y., Morisawa Toshiyuki, Moriwaki Shigenori, Mukohyama Shinji, Nagano Shigeo, Nakamura Kouji, Nakano Hiroyuki, Nakao Kenichi, Nakasuka Shinichi, Nakayama Yoshinori, Nishida Erina, Nishizawa Atsushi, Niwa Yoshito, Noumi Taiga, Obuchi Yoshiyuki, Ohishi Naoko, Ohkawa Masashi, Okada Kenshi, Okada Norio, Okutomi Koki, Oohara Kenichi, Sago Norichika, Saijo Motoyuki, Saito Ryo, Sakagami Masaaki, Sakai Shin-ichiro, Sakata Shihori, Sasaki Misao, Sato Takashi, Shibata Masaru, Shibata Kazunori, Shimo-oku Ayumi, Shinkai Hisaaki, Shoda Ayaka, Somiya Kentaro, Sotani Hajime, Suemasa Aru, Sugiyama Naoshi, Suwa Yudai, Suzuki Rieko, Tagoshi Hideyuki, Takahashi Fuminobu, Takahashi Kakeru, Takahashi Keitaro, Takahashi Ryutaro, Takahashi Ryuichi, Takahashi Hirotaka, Akiteru Takamori, Takano Tadashi, Tanaka Nobuyuki, Taniguchi Keisuke, Taruya Atsushi, Tashiro Hiroyuki, Torii Yasuo, Toyoshima Morio, Tsujikawa Shinji, Ueda Akitoshi, Ueda Ken-ichi, Ushiba Takafumi, Utashima Masayoshi, Wakabayashi Yaka, Yagi Kent, Yamamoto Kazuhiro, Yamazaki Toshitaka, Yoo Chul-Moon, Yoshida Shijun, Yoshino Taizoh

INTERNATIONAL JOURNAL OF MODERN PHYSICS D Vol. 28 ( 12 ) 2019.9

Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data Open Access

Hikage Chiaki, Oguri Masamune, Hamana Takashi, More Surhud, Mandelbaum Rachel, Takada Masahiro, Kohlinger Fabian, Miyatake Hironao, Nishizawa Atsushi J., Aihara Hiroaki, Armstrong Robert, Bosch James, Coupon Jean, Ducout Anne, Ho Paul, Hsieh Bau-Ching, Komiyama Yutaka, Lanusse Francois, Leauthaud Alexie, Lupton Robert H., Medezinski Elinor, Mineo Sogo, Miyama Shoken, Miyazaki Satoshi, Murata Ryoma, Murayama Hitoshi, Shirasaki Masato, Sifon Cristobal, Simet Melanie, Speagle Joshua, Spergel David N., Strauss Michael A., Sugiyama Naoshi, Tanaka Masayuki, Utsumi Yousuke, Wang Shiang-Yu, Yamada Yoshihiko

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 71 ( 2 ) 2019.4

Discovery of the First Low-luminosity Quasar at z > 7 Open Access

Matsuoka Yoshiki, Onoue Masafusa, Kashikawa Nobunari, Strauss Michael A., Iwasawa Kazushi, Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Koyama Shuhei, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

ASTROPHYSICAL JOURNAL LETTERS Vol. 872 ( 1 ) 2019.2

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z=6 Open Access

Matsuoka Yoshiki, Strauss Michael A., Kashikawa Nobunari, Onoue Masafusa, Iwasawa Kazushi, Tang Ji-Jia, Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

ASTROPHYSICAL JOURNAL Vol. 869 ( 2 ) 2018.12

Planck 2015 Constraints on the Non-flat XCDM Inflation Model Open Access

Ooba Junpei, Ratra Bharat, Sugiyama Naoshi

ASTROPHYSICAL JOURNAL Vol. 869 ( 1 ) 2018.12

Thermal Sunyaev-Zel'dovich Effect in the IGM due to Primordial Magnetic Fields

Minoda Teppei, Hasegawa Kenji, Tashiro Hiroyuki, Ichiki Kiyotomo, Sugiyama Naoshi

GALAXIES Vol. 6 ( 4 ) 2018.12

Planck 2015 Constraints on the Nonflat phi CDM Inflation Model Open Access

Ooba Junpei, Ratra Bharat, Sugiyama Naoshi

ASTROPHYSICAL JOURNAL Vol. 866 ( 1 ) 2018.10

Stellar mass dependence of the 21-cm signal around the first star and its impact on the global signal Open Access

Tanaka Toshiyuki, Hasegawa Kenji, Yajima Hidenobu, Kobayashi Masato I. N., Sugiyama Naoshi

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Vol. 480 ( 2 ) page： 1925-1937 2018.10

Planck 2015 Constraints on the Non-flat Lambda CDM Inflation Model Open Access

Ooba Junpei, Ratra Bharat, Sugiyama Naoshi

ASTROPHYSICAL JOURNAL Vol. 864 ( 1 ) 2018.9

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 <= z <= 6.9 Open Access

Matsuoka Yoshiki, Iwasawa Kazushi, Onoue Masafusa, Kashikawa Nobunari, Strauss Michael A., Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES Vol. 237 ( 1 ) 2018.7

Updated observational constraints on quintessence dark energy models Open Access

Durrive Jean-Baptiste, Ooba Junpei, Ichiki Kiyotomo, Sugiyama Naoshi

PHYSICAL REVIEW D Vol. 97 ( 4 ) 2018.2

The Hyper Suprime-Cam SSP Survey: Overview and survey design Open Access

Aihara Hiroaki, Arimoto Nobuo, Armstrong Robert, Arnouts Stephane, Bahcall Neta A., Bickerton Steven, Bosch James, Bundy Kevin, Capak Peter L., Chan James H. H., Chiba Masashi, Coupon Jean, Egami Eiichi, Enoki Motohiro, Finet Francois, Fujimori Hiroki, Fujimoto Seiji, Furusawa Hisanori, Furusawa Junko, Goto Tomotsugu, Goulding Andy, Greco Johnny P., Greene Jenny E., Gunn James E., Hamana Takashi, Harikane Yuichi, Hashimoto Yasuhiro, Hattori Takashi, Hayashi Masao, Hayashi Yusuke, Helminiak Krzysztof G., Higuchi Ryo, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Kuiyun, Huang Song, Ikeda Hiroyuki, Imanishi Masatoshi, Inoue Akio K., Iwasawa Kazushi, Iwata Ikuru, Jaelani Anton T., Jian Hung-Yu, Kamata Yukiko, Karoji Hiroshi, Kashikawa Nobunari, Katayama Nobuhiko, Kawanomoto Satoshi, Kayo Issha, Koda Jin, Koike Michitaro, Kojima Takashi, Komiyama Yutaka, Konno Akira, Koshida Shintaro, Koyama Yusei, Kusakabe Haruka, Leauthaud Alexie, Lee Chien-Hsiu, Lin Lihwai, Lin Yen-Ting, Lupton Robert H., Mandelbaum Rachel, Matsuoka Yoshiki, Medezinski Elinor, Mineo Sogo, Miyama Shoken, Miyatake Hironao, Miyazaki Satoshi, Momose Rieko, More Anupreeta, More Surhud, Moritani Yuki, Moriya Takashi J., Morokuma Tomoki, Mukae Shiro, Murata Ryoma, Murayama Hitoshi, Nagao Tohru, Nakata Fumiaki, Niida Mana, Niikura Hiroko, Nishizawa Atsushi J., Obuchi Yoshiyuki, Oguri Masamune, Oishi Yukie, Okabe Nobuhiro, Okamoto Sakurako, Okura Yuki, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Osato Ken, Ouchi Masami, Price Paul A., Pyo Tae-Soo, Sako Masao, Sawicki Marcin, Shibuya Takatoshi, Shimasaku Kazuhiro, Shimono Atsushi, Shirasaki Masato, Silverman John D., Simet Melanie, Speagle Joshua, Spergel David N., Strauss Michael A., Sugahara Yuma, Sugiyama Naoshi, Suto Yasushi, Suyu Sherry H., Suzuki Nao, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tamura Naoyuki, Tanaka Manobu M., Tanaka Masaomi, Tanaka Masayuki, Tanaka Yoko, Terai Tsuyoshi, Terashima Yuichi, Toba Yoshiki, Tominaga Nozomu, Toshikawa Jun, Turner Edwin L., Uchida Tomohisa, Uchiyama Hisakazu, Umetsu Keiichi, Uraguchi Fumihiro, Urata Yuji, Usuda Tomonori, Utsumi Yousuke, Wang Shiang-Yu, Wang Wei-Hao, Wong Kenneth C., Yabe Kiyoto, Yamada Yoshihiko, Yamanoi Hitomi, Yasuda Naoki, Yeh Sherry, Yonehara Atsunori, Yuma Suraphong

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 70 2018.1

First data release of the Hyper Suprime-Cam Subaru Strategic Program Open Access

Aihara Hiroaki, Armstrong Robert, Bickerton Steven, Bosch James, Coupon Jean, Furusawa Hisanori, Hayashi Yusuke, Ikeda Hiroyuki, Kamata Yukiko, Karoji Hiroshi, Kawanomoto Satoshi, Koike Michitaro, Komiyama Yutaka, Lang Dustin, Lupton Robert H., Mineo Sogo, Miyatake Hironao, Miyazaki Satoshi, Morokuma Tomoki, Obuchi Yoshiyuki, Oishi Yukie, Okura Yuki, Price Paul A., Takata Tadafumi, Tanaka Manobu M., Tanaka Masayuki, Tanaka Yoko, Uchida Tomohisa, Uraguchi Fumihiro, Utsumi Yousuke, Wang Shiang-Yu, Yamada Yoshihiko, Yamanoi Hitomi, Yasuda Naoki, Arimoto Nobuo, Chiba Masashi, Finet Francois, Fujimori Hiroki, Fujimoto Seiji, Furusawa Junko, Goto Tomotsugu, Goulding Andy, Gunn James E., Harikane Yuichi, Hattori Takashi, Hayashi Masao, Helminiak Krzysztof G., Higuchi Ryo, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Kuiyun, Huang Song, Imanishi Masatoshi, Iwata Ikuru, Jaelani Anton T., Jian Hung-Yu, Kashikawa Nobunari, Katayama Nobuhiko, Kojima Takashi, Konno Akira, Koshida Shintaro, Kusakabe Haruka, Leauthaud Alexie, Lee Chien-Hsiu, Lin Lihwai, Lin Yen-Ting, Mandelbaum Rachel, Matsuoka Yoshiki, Medezinski Elinor, Miyama Shoken, Momose Rieko, More Anupreeta, More Surhud, Mukae Shiro, Murata Ryoma, Murayama Hitoshi, Nagao Tohru, Nakata Fumiaki, Niida Mana, Niikura Hiroko, Nishizawa Atsushi J., Oguri Masamune, Okabe Nobuhiro, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Ouchi Masami, Pyo Tae-Soo, Shibuya Takatoshi, Shimasaku Kazuhiro, Simet Melanie, Speagle Joshua, Spergel David N., Strauss Michael A., Sugahara Yuma, Sugiyama Naoshi, Suto Yasushi, Suzuki Nao, Tait Philip J., Takada Masahiro, Terai Tsuyoshi, Toba Yoshiki, Turner Edwin L., Uchiyama Hisakazu, Umetsu Keiichi, Urata Yuji, Usuda Tomonori, Yeh Sherry, Yuma Suraphong

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 70 2018.1

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 quasars and luminous galaxies at 5.7 < z <= 6.8 Open Access

Matsuoka Yoshiki, Onoue Masafusa, Kashikawa Nobunari, Iwasawa Kazushi, Strauss Michael A., Nagao Tohru, Imanishi Masatoshi, Lee Chien-Hsiu, Akiyama Masayuki, Asami Naoko, Bosch James, Foucaud Sebastien, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 70 2018.1

Hyper Suprime-Cam: System design and verification of image quality

Miyazaki Satoshi, Komiyama Yutaka, Kawanomoto Satoshi, Doi Yoshiyuki, Furusawa Hisanori, Hamana Takashi, Hayashi Yusuke, Ikeda Hiroyuki, Kamata Yukiko, Karoji Hiroshi, Koike Michitaro, Kurakami Tomio, Miyama Shoken, Morokuma Tomoki, Nakata Fumiaki, Namikawa Kazuhito, Nakaya Hidehiko, Nariai Kyoji, Obuchi Yoshiyuki, Oishi Yukie, Okada Norio, Okura Yuki, Tait Philip, Takata Tadafumi, Tanaka Yoko, Tanaka Masayuki, Terai Tsuyoshi, Tomono Daigo, Uraguchi Fumihiro, Usuda Tomonori, Utsumi Yousuke, Yamada Yoshihiko, Yamanoi Hitomi, Aihara Hiroaki, Fujimori Hiroki, Mineo Sogo, Miyatake Hironao, Oguri Masamune, Uchida Tomohisa, Tanaka Manobu M., Yasuda Naoki, Takada Masahiro, Murayama Hitoshi, Nishizawa Atsushi J., Sugiyama Naoshi, Chiba Masashi, Futamase Toshifumi, Wang Shiang-Yu, Chen Hsin-Yo, Ho Paul T. P., Liaw Eric J. Y., Chiu Chi-Fang, Ho Cheng-Lin, Lai Tsang-Chih, Lee Yao-Cheng, Jeng Dun-Zen, Iwamura Satoru, Armstrong Robert, Bickerton Steve, Bosch James, Gunn James E., Lupton Robert H., Loomis Craig, Price Paul, Smith Steward, Strauss Michael A., Turner Edwin L., Suzuki Hisanori, Miyazaki Yasuhito, Muramatsu Masaharu, Yamamoto Koei, Endo Makoto, Ezaki Yutaka, Ito Noboru, Kawaguchi Noboru, Sofuku Satoshi, Taniike Tomoaki, Akutsu Kotaro, Dojo Naoto, Kasumi Kazuyuki, Matsuda Toru, Imoto Kohei, Miwa Yoshinori, Suzuki Masayuki, Takeshi Kunio, Yokota Hideo

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 70 2018.1

Mean Energy Density of Photogenerated Magnetic Fields Throughout the EoR Open Access

Durrive Jean-Baptiste, Tashiro Hiroyuki, Langer Mathieu, Sugiyama Naoshi

PEERING TOWARDS COSMIC DAWN Vol. 12 ( S333 ) page： 60-63 2018

Thermal Sunyaev-Zel'dovich effect in the intergalactic medium with primordial magnetic fields Open Access

Minoda Teppei, Hasegawa Kenji, Tashiro Hiroyuki, Ichiki Kiyotomo, Sugiyama Naoshi

PHYSICAL REVIEW D Vol. 96 ( 12 ) 2017.12

Mean energy density of photogenerated magnetic fields throughout the Epoch of Reionization Reviewed Open Access

Durrive Jean-Baptiste, Tashiro Hiroyuki, Langer Mathieu, Sugiyama Naoshi

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Vol. 472 ( 2 ) page： 1649-1658 2017.12

The FMOS-COSMOS Survey of Star-forming Galaxies at Z similar to 1.6. V: Properties of Dark Matter Halos Containing Ha Emitting Galaxies Reviewed Open Access

Kashino Daichi, More Surhud, Silverman John D., Daddi Emanuele, Renzini Alvio, Sanders David B., Rodighiero Giulia, Puglisi Annagrazia, Kajisawa Masaru, Valentino Francesco, Kartaltepe Jeyhan S., Le Fevre Olivier, Nagao Tohru, Arimoto Nobuo, Sugiyama Naoshi

ASTROPHYSICAL JOURNAL Vol. 843 ( 2 ) 2017.7

Cosmological constraints on scalar-tensor gravity and the variation of the gravitational constant Reviewed Open Access

Ooba Junpei, Ichiki Kiyotomo, Chiba Takeshi, Sugiyama Naoshi

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS ( 4 ) 2017.4

THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. IV. EXCITATION STATE AND CHEMICAL ENRICHMENT OF THE INTERSTELLAR MEDIUM Open Access

Kashino D., Silverman J. D., Sanders D., Kartaltepe J. S., Daddi E., Renzini A., Valentino F., Rodighiero G., Juneau S., Kewley L. J., Zahid H. J., Arimoto N., Nagao T., Chu J., Sugiyama N., Civano F., Ilbert O., Kajisawa M., Le Fevre O., Maier C., Masters D., Miyaji T., Onodera M., Puglisi A., Taniguchi Y.

ASTROPHYSICAL JOURNAL Vol. 835 ( 1 ) 2017.1

The status of DECIGO Open Access

Sato Shuichi, Kawamura Seiji, Ando Masaki, Nakamura Takashi, Tsubono Kimio, Araya Akito, Funaki Ikkoh, Ioka Kunihito, Kanda Nobuyuki, Moriwaki Shigenori, Musha Mitsuru, Nakazawa Kazuhiro, Numata Kenji, Sakai Shin-ichiro, Seto Naoki, Takashima Takeshi, Tanaka Takahiro, Agatsuma Kazuhiro, Aoyanagi Koh-suke, Arai Koji, Asada Hideki, Aso Yoichi, Chiba Takeshi, Ebisuzaki Toshikazu, Ejiri Yumiko, Enoki Motohiro, Eriguchi Yoshiharu, Fujimoto Masa-Katsu, Fujita Ryuichi, Fukushima Mitsuhiro, Futamase Toshifumi, Ganzu Katsuhiko, Harada Tomohiro, Hashimoto Tatsuaki, Hayama Kazuhiro, Hikida Wataru, Himemoto Yoshiaki, Hirabayashi Hisashi, Hiramatsu Takashi, Hong Feng-Lei, Horisawa Hideyuki, Hosokawa Mizuhiko, Ichiki Kiyotomo, Ikegami Takeshi, Inoue Kaiki T., Ishidoshiro Koji, Ishihara Hideki, Ishikawa Takehiko, Ishizaki Hideharu, Ito Hiroyuki, Itoh Yousuke, Kawashima Nobuki, Kawazoe Fumiko, Kishimoto Naoko, Kiuchi Kenta, Kobayashi Shiho, Kohri Kazunori, Koizumi Hiroyuki, Kojima Yasufumi, Kokeyama Keiko, Kokuyama Wataru, Kotake Kei, Kozai Yoshihide, Kudoh Hideaki, Kunimori Hiroo, Kuninaka Hitoshi, Kuroda Kazuaki, Maeda Kei-ichi, Matsuhara Hideo, Mino Yasushi, Miyakawa Osamu, Miyoki Shinji, Morimoto Mutsuko Y., Morioka Tomoko, Morisawa Toshiyuki, Mukohyama Shinji, Nagano Shigeo, Naito Isao, Nakamura Kouji, Nakano Hiroyuki, Nakao Kenichi, Nakasuka Shinichi, Nakayama Yoshinori, Nishida Erina, Nishiyama Kazutaka, Nishizawa Atsushi, Niwa Yoshito, Noumi Taiga, Obuchi Yoshiyuki, Ohashi Masatake, Ohishi Naoko, Ohkawa Masashi, Okada Norio, Onozato Kouji, Oohara Kenichi, Sago Norichika, Saijo Motoyuki, Sakagami Masaaki, Sakata Shihori, Sasaki Misao, Sato Takashi, Shibata Masaru, Shinkai Hisaaki, Somiya Kentaro, Sotani Hajime, Sugiyama Naoshi, Suwa Yudai, Suzuki Rieko, Tagoshi Hideyuki, Takahashi Fuminobu, Takahashi Kakeru, Takahashi Keitaro, Takahashi Ryutaro, Takahashi Ryuichi, Takahashi Tadayuki, Takahashi Hirotaka, Akiteru Takamori, Takano Tadashi, Taniguchi Keisuke, Taruya Atsushi, Tashiro Hiroyuki, Torii Yasuo, Toyoshima Morio, Tsujikawa Shinji, Tsunesada Yoshiki, Ueda Akitoshi, Ueda Ken-ichi, Utashima Masayoshi, Wakabayashi Yaka, Yamakawa Hiroshi, Yamamoto Kazuhiro, Yamazaki Toshitaka, Yokoyama Jun'ichi, Yoo Chul-Moon, Yoshida Shijun, Yoshino Taizoh

11TH INTERNATIONAL LISA SYMPOSIUM Vol. 840 2017

SUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9 Reviewed Open Access

Matsuoka Yoshiki, Onoue Masafusa, Kashikawa Nobunari, Iwasawa Kazushi, Strauss Michael A., Nagao Tohru, Imanishi Masatoshi, Niida Mana, Toba Yoshiki, Akiyama Masayuki, Asami Naoko, Bosch James, Foucaud Sebastien, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Kawaguchi Toshihiro, Kikuta Satoshi, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Nishizawa Atsushi J., Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Utsumi Yousuke

ASTROPHYSICAL JOURNAL Vol. 828 ( 1 ) 2016.9

Primordial magnetic fields from the string network Reviewed Open Access

Horiguchi Kouichirou, Ichiki Kiyotomo, Sugiyama Naoshi

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS ( 8 ) 2016.8

Reconstruction of CMB temperature anisotropies with primordial CMB induced polarization in galaxy clusters Reviewed Open Access

Liu Guo-Chin, Ichiki Kiyotomo, Tashiro Hiroyuki, Sugiyama Naoshi

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Vol. 460 ( 1 ) page： L104-L108 2016.7

Planck constraints on scalar-tensor cosmology and the variation of the gravitational constant Reviewed Open Access

Ooba Junpei, Ichiki Kiyotomo, Chiba Takeshi, Sugiyama Naoshi

PHYSICAL REVIEW D Vol. 93 ( 12 ) 2016.6

The FMOS-COSMOS Survey of Star-forming Galaxies at z~1.6. III. Survey Design, Performance, and Sample Characteristics Reviewed Open Access

J.D. Silverman, D. Sanders, J.S. Kartaltepe, N. Arimoto, A. Renzini, G. Rodighiero, E. Daddi, J. Zahid, T. Nagao, L.J. Kewley, S.J. Lilly, Naoshi Sugiyama, I. Baronchelli, P. Capak, C.M. Carollo, J. Chu, G. Hasinger, O. Ilbert, S. Juneau, M. Kajisawa, A.M. Koekemoer, K. Kovac, O. Le Fèvre, D. Masters, H.J. McCracken, M. Onodera, A. Schulze, N. Scoville, V. Strazzullo, Y. Taniguchi

The Astrophysical Journal Supplement Series Vol. 220 page： id. 12 (25pp) 2015.9

Magnetic field spectrum at cosmological recombination revisited Reviewed Open Access

Shohei Saga, Kiyotomo Ichiki, Keitaro Takahashi, Naoshi Sugiyama

Physical Review D Vol. 91 ( 12 ) page： 123510 2015.6

Primordial magnetic fields from self-ordering scalar fields Reviewed Open Access

Kouichirou Horiguchi, Kiyotomo Ichiki, Toyokazu Sekiguchi, Naoshi Sugiyama

Journal of Cosmology and Astroparticle Physics Vol. 04 page： 007 2015.4

Stellar mass assembly of brightest cluster galaxies at late times Reviewed Open Access

Takahiro Inagaki, Yen-Ting Lin, Hung-JIn Huang, Bau-Ching Hsieh, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 446 ( 1 ) page： 1107-1114 2015.1

Impact of anisotropic stress of free-streaming particles on gravitational waves induced by cosmological density perturbations Reviewed Open Access

Shohei Saga, Kiyotomo Ichiki, Naoshi Sugiyama

Physical Review D Vol. 91 ( 2 ) page： 024030 2015.1

Probing large-scale filaments with HI and ³ HeII Reviewed Open Access

Y. Takeuchi, S. Zaroubi, N. Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 444 ( 3 ) page： 2236-2250 2014.11

Implications of the B-mode polarization measurement for direct detection of inflationary gravitational waves Reviewed Open Access

S. Kuroyanagi, S. Tsujikawa, T. Chiba, N. Sugiyama

Physical Review D Vol. 90 ( 6 ) page： 063513 2014.9

The FMOS-COSMOS Survey of Star-forming Galaxies at z ~ 1.6. II. The Mass-Metallicity Relation and the Dependence on Star Formation Rate and Dust Extinction Reviewed Open Access

H. J. Zahid, D. Kashino, J. D. Silverman, L. J. Kewley, E. Daddi, A. Renzini, G. Rodighiero, T. Nagao, N. Arimoto, D. B. Sanders, J. Kartaltepe, S. J. Lilly, C. Maier, M. J. Geller, P. Capak, C. M. Carollo, J. Chu, G. Hasinger, O. Ilbert, M. Kajisawa, A. M. Koekemoer, K. Kovac, O. Le Fevre, D. Masters, H. J. McCracken, M. Onodera, N. Scoville, V. Strazzullo, Naoshi Sugiyama, Y. Taniguchi, The COSMOS Team

The Astrophysical Journal Vol. 792 ( 1 ) page： 75 2014.9

Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products Reviewed Open Access

S. Aoyama, T. Sekiguchi, K. Ichiki, N. Sugiyama

Journal of Cosmology and Astroparticle Physics ( 07 ) page： 021 2014.7

Introduction to temperature anisotropies of Cosmic Microwave Background radiation Invited Reviewed Open Access

Naoshi Sugiyama

Progress of Theoretical and Experimental Physics ( 06B101 ) 2014.4

Cosmological signatures of tilted isocurvature perturbations: reionization and 21cm fluctuations Reviewed Open Access

T. Sekiguchi, H. Tashiro, J. Silk, N. Sugiyama

Journal of Cosmology and Astroparticle Physics ( 03 ) page： 001 2014.3

The effect of primordial black holes on 21-cm fluctuations Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 435 ( 4 ) page： 3001-3008 2013.11

Optimal constraint on gNL from CMB Invited Reviewed Open Access

Toyokazu Sekiguchi, Naoshi Sugiyama

Journal of Cosmology and Astroparticle Physics Vol. 09 page： 002 2013.9

Understanding the nature of luminous red galaxies (LRGs): connecting LRGs to central and satellite subhaloes Reviewed Open Access

Shogo Masaki, Chiaki Hikage, Masahiro Takada, David Spergel, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 43 ( 4 ) page： 3506-3522 2013.8

Generation of magnetic fields in Einstein-aether gravity Reviewed Open Access

Shohei Saga, Maresuke Shiraichi, Kiyotomo Ichiki, Naoshi Sugiyama

Physical Review D Vol. 87 ( 10 ) page： 104025 2013.5

Exploring the origin of the fine structures in the CMB temperature angular power spectrum Reviewed Open Access

Kohei Kumazaki, Kiyotomo Ichiki, Naoshi Sugiyama, Joseph Silk

Physical Review D Vol. 87 ( 2 ) page： 023008 2013.1

Shadows of multi-black holes: Analytic exploration Reviewed

Akifumi Yumoto, Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama

Physical Review D Vol. 86 ( 10 ) page： 103001 2012.11

Stochastic gravitational wave background originating from halo mergers Reviewed Open Access

Takahiro Inagaki, Keitaro Takahashi, Naoshi Sugiyama

Physical Review D Vol. 85 ( 10 ) page： 104051 2012.5

Ionized bubble number count as a probe of non-Gaussianity Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society, Vol. 420 ( 1 ) page： 441-446 2012.2

Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe observations Reviewed Open Access

Kiyotomo Ichik, Keitaro Takahashi, Naoshi Sugiyama

Physical Review D Vol. 85 ( 4 ) page： 043009 2012.2

Fine features in the primordial power spectrum Reviewed Open Access

Kohei Kumazak, Shuichiro Yokoyama, Naoshi Sugiyama

Journal of Cosmology and Astroparticle Physics Vol. 12 page： 008 2011.12

Modification of the halo mass function by kurtosis associated with primordial non-Gaussianity Reviewed Open Access

Shuichiro Yokoyama, Naoshi Sugiyama, Saleem Zaroubi, Joseph Silk

Monthly Notices of the Royal Astronomical Society Vol. 417 ( 2 ) page： 1074-1087 2011.10

Language：English Publishing type：Research paper (scientific journal)

We study the halo mass function in the presence of a kurtosis type of primordial non-Gaussianity. The kurtosis corresponds to the trispectrum as defined in Fourier space. The primordial trispectrum is commonly characterized by two parameters, tau_NL and g_NL. We focus on tau_NL which is an important parameter to test the physics of multifield inflation models.

DOI： 10.1111/j.1365-2966.2011.19323.x

Shadows of colliding black holes Reviewed Open Access

Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama

Physical Review D Vol. 84 ( 6 ) 2011.9

Language：English Publishing type：Research paper (scientific journal)

We compute the shadows of colliding black holes using the Kastor-Traschen cosmological multiblack hole solution that is an exact solution describing the collision of maximally charged black holes with a positive cosmological constant. We find that in addition to the shadow of each black hole, an eyebrowlike structure appears as the black holes come close to each other. These features can be used as probes to find the multiblack hole system at the final stage of its merger process.

DOI： 10.1103/PhysRevD.84.063008

Formulation and constraints on decaying dark matter with finite mass daughter particles Reviewed Open Access

Shohei Aoyama, Kiyotomo Ichiki, Daisuke Nitta, Naoshi Sugiyama

Journal of Cosmology and Astroparticle Physics Vol. 2011 ( 09 ) page： 025 2011.9

Modification of the halo mass function by kurtosis associated with primordial non-Gaussianity Reviewed Open Access

Shuichiro Yokoyama, Naoshi Sugiyama, Saleem Zaroubi, Joseph Silk

Monthly Notices of the Royal Astronomical Society Vol. 417 ( 2 ) page： 1074-1087 2011.8

Observational Search for PeV-EeV Tau Neutrino from GRB081203A Reviewed Open Access

Y. Aita, Y. Asaoka, T. chonan, M. Jobashi, M. Masuda, Y. Morino, K. Noda, M. Sasaki, J. Asoh, N. Ishikawa, S. Ogawa, J.G. Lenearned, S. Matsuno, S. Olsen, P-M. Binder, J. Hamilton, N. Sugiyama, Y. Watanabe

The Astrophysical Journal Letters Vol. 736 ( 1 ) page： L12-L16 2011.7

Language：English Publishing type：Research paper (scientific journal)

We report the first observational search for tau neutrinos (ντ) from gamma-ray bursts (GRBs) using one of the Ashra light collectors. The Earth-skimming ντ technique of imaging Cherenkov τ showers was applied as a detection method. We set stringent upper limits on the ντ fluence in PeV-EeV region for 3780 s (between 2.83 and 1.78 hr before) and another 3780 s (between 21.2 and 22.2 hr after) surrounding GRB081203A triggered by the Swift satellite. This first search for PeV-EeV ντ complements other experiments in energy range and methodology, and suggests the prologue of "multi-particle astronomy" with a precise determination of time and location.

DOI： 10.1088/2041-8205/736/1/L12

Open Access

Sunyaev-Zel'dovich power spectrum produced by primordial magnetic fields Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 411 ( 2 ) page： 1284-1292 2011.2

Prospects for direct detection of inflationary gravitational waves by next generation interferometric detectors Reviewed Open Access

Sachiko Kuroyanagi, Takeshi Chiba, Naoshi Sugiyama

Physical Review D Vol. 83 ( 4 ) 2011.2

Language：English Publishing type：Research paper (scientific journal)

We study the potential impact of detecting the inflationary gravitational wave background by the future space-based gravitational wave detectors, such as DECIGO and BBO. The signal-to-noise ratio of each experiment is calculated for chaotic/natural/hybrid inflation models by using the precise predictions of the gravitational wave spectrum based on numerical calculations. We investigate the dependence of each inflation model on the reheating temperature which influences the amplitude and shape of the spectrum, and find that the gravitational waves could be detected for chaotic/natural inflation models with high reheating temperature. From the detection of the gravitational waves, a lower bound on the reheating temperature could be obtained. The implications of this lower bound on the reheating temperature for particle physics are also discussed.

DOI： 10.1103/PhysRevD.83.043514

Non-Gaussian Error Contribution to Likelihood Analysis of the Matter Power Spectrum Reviewed Open Access

RYuichi Takahashi, Naoki Yoshida, MAsahiro Takada, Takahiko Matsubara, Naoshi Sugiyama, Issha Kayo, Takahiro Nishimichi, Shun Saito, Atsushi Taruya

Astrophysical Journal Vol. 726 ( 1 ) page： 7 2011.1

Language：English Publishing type：Research paper (scientific journal)

We study the sample variance of the matter power spectrum for the standard Λ cold dark matter universe. We use a total of 5000 cosmological N-body simulations to study in detail the distribution of best-fit cosmological parameters and the baryon acoustic peak positions. The obtained distribution is compared with the results from the Fisher matrix analysis with and without including non-Gaussian errors. For the Fisher matrix analysis, we compute the derivatives of the matter power spectrum with respect to cosmological parameters using directly full nonlinear simulations. We show that the non-Gaussian errors increase the unmarginalized errors by up to a factor of five for k max = 0.4 h Mpc–1 if there is only one free parameter, provided other parameters are well determined by external information. On the other hand, for multi-parameter fitting, the impact of the non-Gaussian errors is significantly mitigated due to severe parameter degeneracies in the power spectrum. The distribution of the acoustic peak positions is well described by a Gaussian distribution, with its width being consistent with the statistical interval predicted from the Fisher matrix. We also examine systematic bias in the best-fit parameter due to the non-Gaussian errors. The bias is found to be smaller than the 1σ statistical error for both the cosmological parameters and the acoustic scale positions.

DOI： 10.1088/0004-637X/726/1/7

Open Access

Halo occupation distribution of massive galaxies since z= 1 Reviewed Open Access

Y. Matsuoka, S. Masaki, K. Kawara, Naoshi Suigyama

Monthly Notices of the Royal Astronomical Society Vol. 410 ( 1 ) page： 548-558 2011.1

Language：English Publishing type：Research paper (scientific journal)

We present a clustering analysis of ˜60 000 massive (stellar mass M★ > 1011 Mȯ) galaxies out to z= 1 drawn from 55.2 deg2 of the UKIRT Infrared Deep Sky Survey (UKIDSS) and the Sloan Digital Sky Survey (SDSS) II Supernova Survey. Strong clustering is detected for all the subsamples of massive galaxies characterized by different stellar masses (M★= 1011.0-11.5 Mȯ, 1011.5-12.0 Mȯ) or rest-frame colours (blue: U-V < 1.0, red: U-V > 1.0). We find that more mature (more massive or redder) galaxies are more clustered, which implies that the more mature galaxies have started stellar-mass assembly earlier within the highly biased region where the structure formation has also started earlier. By means of halo occupation distribution (HOD) models fitted to the observed angular correlation function, we infer the properties of the underlying host dark haloes. We find that the estimated bias factors and host halo masses are systematically larger for galaxies with larger stellar masses, which is consistent with the general agreement that the capability of hosting massive galaxies depends strongly on halo mass. The estimated effective halo masses are ˜1014 Mȯ, which gives the stellar-mass to halo-mass ratios of ˜0.003. The observed evolution of bias factors indicates rapid evolution of spatial distributions of cold dark matter relative to those traced by the massive galaxies, while the transition of host halo masses might imply that the fractional mass growth rate of haloes is less than those of stellar systems. The inferred halo masses and high fractions of central galaxies indicate that the massive galaxies in the current sample are possibly equivalent to central galaxies of galaxy clusters.

DOI： 10.1111/j.1365-2966.2010.17464.x

Open Access

Systematic study of gravitational waves from galaxy mergers Reviewed Open Access

Takahiro Inagaki, Keitaro Takahashi, Shogo Masaki, Naoshi Sugiyama

Physical Review D Vol. 82 ( 12 ) page： 124007 2010.12

Language：English Publishing type：Research paper (scientific journal)

A systematic study of gravitational waves from galaxy mergers, through N-body simulations, was performed. In particular, we investigated the relative importance of galaxy components (disk, bulge and halo) and effects of initial relative velocity, relative angular momentum and mass ratio of the galaxies. We found that the features of light curve of gravitational waves, such as peak width and luminosity, are reliably simulated with particle numbers larger than ˜104. Dominant contribution to gravitational wave emission came from the halo component, while peak luminosity amounted to 1031erg/sec for the collision of two halos with mass 3.8×1012h-1Mȯ. We also found that the initial relative velocity in the direction of the initial separation did not significantly affect gravitational wave emission, while the initial relative angular momentum broadened the peak width and suppressed the luminosity. Mass dependence of the peak luminosity was also investigated, and we obtained evidence that the luminosity is proportional to the cubic mass when the scaling relation is satisfied. This behavior was considered by a simple analysis.

DOI： 10.1103/PhysRevD.82.124007

Ghost dark matter Reviewed Open Access

Tomonori Furukawa, Shuichiro Yokoyama, Kiyotomo Ichiki, Naoshi Sugiyama, Shinji Mukohyama

Journal of Cosmology and Astroparticle Physics Vol. 2010 ( 05 ) page： 007 2010.5

Language：English Publishing type：Research paper (scientific journal)

We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolution and the large-scale structure (LSS) in the ΛGDM universe, i.e. a late-time universe dominated by a cosmological constant and ghost dark matter. The FRW background of the ΛGDM universe is indistinguishable from that of the standard ΛCDM universe if Mgtrsim1eV, where M is the scale of spontaneous Lorentz breaking. From the LSS we find a stronger bound: Mgtrsim10eV. For smaller M, ghost dark matter would have non-negligible sound speed after the matter-radiation equality, and thus the matter power spectrum would significantly differ from observation. These bounds are compatible with the phenomenological upper bound M<100GeV known in the literature.

DOI： 10.1088/1475-7516/2010/05/007

DECIGO and DECIGo pathfinder Reviewed Open Access

Masaki Ando, Seiji kawamura, et al.

Classical and Quantum Gravity Vol. 27 ( 8 ) page： 084010 2010.4

Language：English Publishing type：Research paper (scientific journal)

A space gravitational-wave antenna, DECIGO (DECI-hertz interferometer Gravitational wave Observatory), will provide fruitful insights into the universe, particularly on the formation mechanism of supermassive black holes, dark energy and the inflation of the universe. In the current pre-conceptual design, DECIGO will be comprising four interferometer units; each interferometer unit will be formed by three drag-free spacecraft with 1000 km separation. Since DECIGO will be an extremely challenging mission with high-precision formation flight with long baseline, it is important to increase the technical feasibility before its planned launch in 2027. Thus, we are planning to launch two milestone missions. DECIGO pathfinder (DPF) is the first milestone mission, and key components for DPF are being tested on ground and in orbit. In this paper, we review the conceptual design and current status of DECIGO and DPF.

DOI： 10.1088/0264-9381/27/8/084010

Forecast constraints on inflation from combined CMB and gravitational wave direct detection experiments Reviewed Open Access

Sachiko Kuroyanagi, Christopher Gordon, Joseph Silk, Naoshi Sugiyama

Physical Review D Vol. 81 ( 8 ) page： 083524 2010.4

Language：English Publishing type：Research paper (scientific journal)

We study how direct detection of the inflationary gravitational wave background constrains inflationary parameters and complements CMB polarization measurements. The error ellipsoids calculated using the Fisher information matrix approach with Planck and the direct detection experiment, Big Bang Observer (BBO), show different directions of parameter degeneracy, and the degeneracy is broken when they are combined. For a slow-roll parametrization, we show that BBO could significantly improve the constraints on the tensor-to-scalar ratio compared with Planck alone. We also look at a quadratic and a natural inflation model. In both cases, if the temperature of reheating is also treated as a free parameter, then the addition of BBO can significantly improve the error bars. In the case of natural inflation, we find that the addition of BBO could even partially improve the error bars of a cosmic variance-limited CMB experiment.

DOI： 10.1103/PhysRevD.81.083524

Numerical study of primordial magnetic field amplification by inflation-produced gravitational waves Reviewed

Sachiko Kuroyanagi, Hiroyuki Tashiro, Naoshi Sugiyama

Physical Review D Vol. 81 ( 2 ) page： 023510 2010.1

Language：English Publishing type：Research paper (scientific journal)

We numerically study the interaction of inflation-produced magnetic fields with gravitational waves, both of which originate from quantum fluctuations during inflation. The resonance between the magnetic field perturbations and the gravitational waves has been suggested as a possible mechanism for magnetic field amplification. However, some analytical studies suggest that the effect of the inflationary gravitational waves is too small to provide significant amplification. Our numerical study shows more clearly how the interaction affects the magnetic fields and confirms the weakness of the influence of the gravitational waves. We present an investigation based on the magnetohydrodynamic approximation and take into account the differences of the Alfven speed.

DOI： 10.1103/PhysRevD.81.023510

Simulations of Wide-Field Weak Lensing Surveys. I. Basic Statistics and Non-Gaussian Effects Reviewed Open Access

Masanori Sato, Takashi Hamana, Ryuichi takahashi, Masahiro Takada, Naoki Yoshida, Takahiko Matsubara, Naoshi Sugiyama

The Astrophysical Journal, Volume Vol. 701 ( 2 ) page： 945-954 2009.8

Language：English Publishing type：Research paper (scientific journal)

We study the lensing convergence power spectrum and its covariance for a standard ΛCDM cosmology. We run 400 cosmological N-body simulations and use the outputs to perform a total of 1000 independent ray-tracing simulations. We compare the simulation results with analytic model predictions. The semianalytic model based on Smith et al. fitting formula underestimates the convergence power by ~ 30% at arcmin angular scales. For the convergence power spectrum covariance, the halo model reproduces the simulation results remarkably well over a wide range of angular scales and source redshifts. The dominant contribution at small angular scales comes from the sample variance due to the number fluctuations of halos in a finite survey volume. The signal-to-noise ratio for the convergence power spectrum is degraded by the non-Gaussian covariances by up to a factor of 5 for a weak lensing survey to zs ~ 1. The probability distribution of the convergence power spectrum estimators, among the realizations, is well approximated by a χ2 distribution with broadened variance given by the non-Gaussian covariance, but has a larger positive tail. The skewness and kurtosis have non-negligible values especially for a shallow survey. We argue that a prior knowledge on the full distribution may be needed to obtain an unbiased estimate on the ensemble-averaged band power at each angular scale from a finite volume survey.

DOI： 10.1088/0004-637X/701/2/945

Open Access

Simulations of Baryon Acoustic Oscillations. II. Covariance Matrix of the Matter Power Spectrum Reviewed Open Access

Ryuichi Takahashi, Naoki Yoshida, Masahiro Takada, Takahiko Matsubara, Naoshi Sugiyama, Issha Kayo, Atsushi J. Nishizawa, Takahiro Nishimichi, Shun Saito, Atsushi Taruya

The Astrophysical Journal Vol. 700 ( 1 ) page： 479-490 2009.7

Language：English Publishing type：Research paper (scientific journal)

We use 5000 cosmological N-body simulations of 1 h -3 Gpc3 box for the concordance ΛCDM model in order to study the sampling variances of a nonlinear matter power spectrum. We show that the non-Gaussian errors can be important even on large length scales relevant for baryon acoustic oscillations (BAOs). Our findings are the following: (1) the non-Gaussian errors degrade the cumulative signal-to-noise ratios (S/Ns) for the power spectrum amplitude by up to a factor of 2 and 4 for redshifts z = 1 and 0, respectively; (2) there is little information on the power spectrum amplitudes in the quasi-nonlinear regime, confirming the previous results; (3) the distribution of power spectrum estimators at BAO scales, among the realizations, is well approximated by a Gaussian distribution with variance that is given by the diagonal covariance component. (4) For the redshift-space power spectrum, the degradation in S/N by non-Gaussian errors is mitigated due to nonlinear redshift distortions; (5) for an actual galaxy survey, the additional shot noise contamination compromises the cosmological information inherent in the galaxy power spectrum, but also mitigates the impact of non-Gaussian errors. The S/N is degraded by up to 30% for a Wide-Field Fiber-Fed Optical Multi-Object Spectrograph-type survey; (6) the finite survey volume causes additional non-Gaussian errors via the correlations of long-wavelength fluctuations with the fluctuations we want to measure, further degrading the S/N values by about 30% even at high redshift z = 3.

DOI： 10.1088/0004-637X/700/1/479

Open Access

Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe Reviewed Open Access

Maresuke Shiraishi, Kazuhide Ichikawa, Kiyotomo Ichiki, Naoshi Sugiyama, Masahidee Yamaguchi

Journal of Cosmology and Astroparticle Physics Vol. 07 page： 005 2009.7

Language：English Publishing type：Research paper (scientific journal)

In this paper, we put constraints on neutrino properties such as mass mν and degeneracy parameters ξi from WMAP5 data and light element abundances by using a Markov chain Monte Carlo (MCMC) approach. In order to take consistently into account the effects of the degeneracy parameters, we run the Big Bang Nucleosynthesis code for each value of ξi and the other cosmological parameters to estimate the Helium abundance, which is then used to calculate CMB anisotropy spectra instead of treating it as a free parameter. We find that the constraint on mν is fairly robust and does not vary very much even if the lepton asymmetry is allowed, and is given by ∑mν < 1.3 eV (95%C.L.).

DOI： 10.1088/1475-7516/2009/07/005

DECIGO pathfinder Reviewed Open Access

Ando, Masaki; Kawamura, Seiji; Sato, Shuichi; Nakamura, Takashi; Tsubono, Kimio; Araya, Akito; Funaki, Ikkoh; Ioka, Kunihito; Kanda, Nobuyuki; Moriwaki, Shigenori; Musha, Mitsuru; Nakazawa, Kazuhiro; Numata, Kenji; Sakai, Shin-ichiro; Seto, Naoki; Takashima, Takeshi; Tanaka, Takahiro; Agatsuma, Kazuhiro; Aoyanagi, Koh-suke; Arai, Koji; Asada, Hideki; Aso, Yoichi; Chiba, Takeshi; Ebisuzaki, Toshikazu; Ejiri, Yumiko; Enoki, Motohiro; Eriguchi, Yoshiharu; Fujimoto, Masa-Katsu; Fujita, Ryuichi; Fukushima, Mitsuhiro; Futamase, Toshifumi; Ganzu, Katsuhiko; Harada, Tomohiro; Hashimoto, Tatsuaki; Hayama, Kazuhiro; Hikida, Wataru; Himemoto, Yoshiaki; Hirabayashi, Hisashi; Hiramatsu, Takashi; Hong, Feng-Lei; Horisawa, Hideyuki; Hosokawa, Mizuhiko; Ichiki, Kiyotomo; Ikegami, Takeshi; Inoue, Kaiki T.; Ishidoshiro, Koji; Ishihara, Hideki; Ishikawa, Takehiko; Ishizaki, Hideharu; Ito, Hiroyuki; Itoh, Yousuke; Kawashima, Nobuki; Kawazoe, Fumiko; Kishimoto, Naoko; Kiuchi, Kenta; Kobayashi, Shiho; Kohri, Kazunori; Koizumi, Hiroyuki; Kojima, Yasufumi; Kokeyama, Keiko; Wataru@Kokuyama; Kotake, Kei; Kozai, Yoshihide; Kudoh, Hideaki; Kunimori, Hiroo; Kuninaka, Hitoshi; Kuroda, Kazuaki; Maeda, Kei-ichi; Matsuhara, Hideo; Mino, Yasushi; Miyakawa, Osamu; Miyoki, Shinji; Morimoto, Mutsuko Y.; Morioka, Tomoko; Morisawa, Toshiyuki; Mukohyama, Shinji; Nagano, Shigeo; Naito, Isao; Nakamura, Kouji; Nakano, Hiroyuki; Nakao, Kenichi; Nakasuka, Shinichi; Nakayama, Yoshinori; Nishida, Erina; Nishiyama, Kazutaka; Nishizawa, Atsushi; Niwa, Yoshito; Noumi, Taiga; Obuchi, Yoshiyuki; Ohashi, Masatake; Ohishi, Naoko; Ohkawa, Masashi; Okada, Norio; Onozato, Kouji; Oohara, Kenichi; Sago, Norichika; Saijo, Motoyuki; Sakagami, Masaaki; Sakata, Shihori; Sasaki, Misao; Sato, Takashi; Shibata, Masaru; Shinkai, Hisaaki; Somiya, Kentaro; Sotani, Hajime; Sugiyama, Naoshi; Suwa, Yudai; Suzuki, Rieko; Tagoshi, Hideyuki; Takahashi, Fuminobu; Takahashi, Kakeru; Takahashi, Keitaro; Takahashi, Ryutaro; Takahashi, Ryuichi; Takahashi, Tadayuki; Takahashi, Hirotaka; Akiteru, Takamori; Takano, Tadashi; Taniguchi, Keisuke; Taruya, Atsushi; Tashiro, Hiroyuki; Torii, Yasuo; Toyoshima, Morio; Tsujikawa, Shinji; Tsunesada, Yoshiki; Ueda, Akitoshi; Ueda, Ken-ichi; Utashima, Masayoshi; Wakabayashi, Yaka; Yamakawa, Hiroshi; Yamamoto, Kazuhiro; Yamazaki, Toshitaka; Yokoyama, Jun'ichi; Yoo, Chul-Moon; Yoshida, Shijun; Yoshino, Taizoh

Classical and Quantum Gravity Vol. 26 ( 9 ) page： 094019 2009.5

Language：English Publishing type：Research paper (scientific journal)

DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory), which is a future space gravitational wave antenna. DECIGO is expected to provide fruitful insights into the universe, particularly about dark energy, the formation mechanism of supermassive black holes and the inflation of the universe. Since DECIGO will be an extremely challenging mission, which will be formed by three drag-free spacecraft with 1000 km separation, it is important to increase the technical feasibility of DECIGO before its planned launch in 2024. Thus, we are planning to launch two milestone missions: DPF and pre-DECIGO. In this paper, we review the conceptual design and current status of the first milestone mission, DPF.

DOI： 10.1088/0264-9381/27/8/084010

The 21-cm signature of early relic HII regions Reviewed Open Access

Midori Tokutani, Naoki Yoshida, S. Peng Oh, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 395 ( 2 ) page： 777-780 2009.5

Language：English Publishing type：Research paper (scientific journal)

We calculate the spin temperature and 21-cm brightness of early HII regions around the first stars. We use outputs from cosmological radiation-hydrodynamics simulations of the formation and evolution of early HII regions. In the pre-re-ionization era, HII regions around massive primordial stars have diameters of a few kpc. The gas within the HII regions is almost fully ionized, but begins recombining after the central stars die off. The relic HII regions are then seen as bright emission sources in hydrogen 21 cm. We make brightness temperature maps of the HII regions, accounting for radiative coupling with Lyman α photons in a simplified manner. The spin temperature in the relic HII region is close to the gas kinetic temperature, generally several hundred to several thousand degrees. We show that the relic HII region can be as bright as δTb ~ 100mK in differential temperature against the cosmic microwave background for an angular resolution of subarcseconds. While individual early HII patches will not be identified by currently planned radio telescopes, the collective fluctuations from early HII regions might imprint signatures in the 21-cm background.

DOI： 10.1111/j.1365-2966.2009.14604.x

Open Access

The Sunyaev-Zel'dovich effect and Faraday rotation contributions of galaxy groups to the CMB angular power spectrum Reviewed Open Access

Hiroyuki Tashiro, Joseph Silk, Mathieu Langer, Naoshi Sugiyama

Monthly Notices of the Royal Astronomical Society Vol. 392 ( 4 ) page： 1421-1428 2009.2

Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models Reviewed Open Access

Publications of the Astronomical Society of Japan Vol. 61 ( 2 ) page： 321-332 2009.2

Language：English Publishing type：Research paper (scientific journal)

We used a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a Λ cold dark matter universe. We compared the results of N-body simulations against three analytical model predictions; standard perturbation theory, renormalized perturbation theory, and a closure approximation. We included the effects from a finite simulation box size under comparison. We determined the values of the maximum wavenumbers, klim1% and klim3%, below which the analytic models and the simulation results agree with accuracy to within 1 and 3 percent. We then provided a simple empirical function that describes the convergence regime determined by comparisons between our simulations and the analytical models. We found that if we use the Fourier modes within the convergence regime alone, the characteristic scale of baryon acoustic oscillations can be determined with an accuracy of 1% from future surveys with a volume of a few h-3Gpc3 at z ∼ 1 or z ∼ 3 in the absence of any systematic distortion of the power spectrum.

DOI： 10.1093/pasj/61.2.321

Optimal location of two laser-interferometric detectors for gravitational wave backgrounds at 100 MHz Reviewed Open Access

Classical and Quantum Gravity Vol. 25 ( 22 ) page： 225011 2008.11

Simulations of baryon acoustic oscillations - I. Growth of large-scale density fluctuations Reviewed Open Access

Ryuichi Takahashi, Naoki Yoshida, Takahiko Matsubara, Naoshi Sugiyama, Issha Kayo, Takahiro Nishimichi, Akihito Shirata, Atsushi Taruya, Shun Saito, Kazuhiro Yahata, Yasushi Suto

Monthly Notices of the Royal Astronomical Society Vol. 389 ( 4 ) page： 1675-1682 2008.10

Search for a Stochastic Background of 100-MHz gravitational Waves with Laser Interferometers Reviewed Open Access

Tomotada Akutsu, Seiji Kawamura, Atsushi Nishizawa, Koji Arai, Kazuhiro Yamamoto, Daisuke Tatsumi, Shigeo Nagano, Erina Nishida, Takeshi Chiba, Ryuichi Takahashi, Naoshi Sugiyama, Titsuhiro Fukushima, Toshitaka Yamazaki, Masa-Katsu Fujimoto

Physical Review Letters Vol. 101 ( 10 ) page： 101101 2008.9

Constraints on primordial black holes by distortions of the cosmic microwave background Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Physical Review D Vol. 78 ( 2 ) page： 023004 2008.7

Electromagnetic properties of the early universe Reviewed Open Access

Keitaro Takahashi, Kiyotomo ichiki, Naoshi Sugiyama

Physical Review D Vol. 77 ( 12 ) page： 124028 2008.6

Cosmic Microwave Background-Weak Lensing Correlation: Analytical and Numerical Study of Nonlinearity and Implications for Dark Energy Reviewed Open Access

Atsushi Nishizawa, Eiichiro Komatsu, Naoki Yoshida, Ryuichi Takahashi, Naoshi Sugiyama

The Astrophysical Journal Letters Vol. 676 ( 2 ) page： L93-L96 2008.4

Analyzing WMAP Observation by Quantum Gravity Reviewed Open Access

Vol. 119 ( 2 ) page： 253-262 2008.2

Laser-interferometric detectors for gravitational wave backgrounds at 100MHz: Detector design and sensitivity Reviewed Open Access

Atsushi Nishizawa, Seiji Kawamura, Tomotada Akutsu, Koji Arai, Kazuhiro Yamamoto, Daisuke Tatsumi, Erina Nishida, Masa-Aki Sakagami, Takeshi Chiba, Ryuichi Takahashi, Naoshi Sugiyama

Vol. 77 ( 2 ) page： 022002 2008.1

Heating of the intergalactic medium by primordial miniquasars Reviewed Open Access

Saleem Zaroubi,Rajat M. Thomas, Naoshi Sugiyama, Joseph Silk

Monthly Notices of the Royal Astronomical Society Vol. 375 ( 4 ) page： 1269-1279 2007.3

*The Epoch of Reionization Reviewed Open Access

Andrew J. Benson, Naoshi Sugiyama, Adi Nusser, Cedric G. Lacey

Mon. Not. Roy. Astro. Soc. Vol. 369 page： 1055-1080 2006.7

Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20 Reviewed Open Access

Katsuaki Asano, Ryo Yamazaki, Naoshi Sugiyama

Vol. 58 ( 1 ) page： L7-L10 2006.2

Probing Primordial Magnetic Fields with the 21-cm Fluctuations Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Mon. Not. Roy. Astro. Soc. Vol. 372 page： 1060-1068 2006

Nonlinear Evolution of Cosmic Magnetic Fields and Cosmic Microwave Background Reviewed Open Access

Vol. D73 page： 083512 2006

Cosmological Magnetic Field: A Fossil of Density Perturbations in the Early Universe Reviewed Open Access

Sicence Vol. 311 ( 5762 ) page： 827-829 2006

Early Reionization with Primordial Magnetic Fields Reviewed Open Access

Hiroyuki Tashiro, Naoshi Sugiyama

Mon. Not. Roy. Astro. Soc. Vol. 368 page： 965-970 2006

Hard X-ray and Gamma-ray Emission Induced by Ultra-High Energy Protons in Cluster Accretion Shocks Reviewed

Susumu Inoue, Felix A. Aharonian, Naoshi Sugiyama

Astrophysical Journal Letter Vol. 628 page： L9-L12 2005

Classifying the Future of Universes with Dark Energy Reviewed Open Access

Takeshi Chiba, Ryuichi Takahashi, Naoshi Sugiyama

Class. Quant. Grav. Vol. 22 page： 3745-3758 2005

Patchy He II reionization and the physical state of the IGM Reviewed Open Access

Liron Gleser, Adi Nusser, Andrew J. Benson, Hiroshi Ohno, Naoshi Sugiyama

Mon. Not. Roy. Astro. Soc. Vol. 361 page： 1399-1414 2005

*Isocurvature Fluctuations Induce Early Star Formation Reviewed Open Access

Naoshi Sugiyama, Saleem Zaroubi, Joseph Silk

Mon. Not. Roy. Astro. Soc. Vol. 354 page： 543-548 2004

WMAP constraints on scalar-tensor cosmology and the variation of the gravitational constant Reviewed

Ryo Nagata, Takeshi Chiba, Naoshi Sugiyama

Physical Review Vol. D69 page： 083512 2004

Gravitational Waves from Supermassive Black Hole Coalescence in a Hierarchical Galaxy Formation Model Reviewed Open Access

Motohiro Enoki, Kaiki T. Inoue, Masahiro Nagashima, Naoshi Sugiyama

Astrophysical Journal Vol. 615 page： 19-28 2004

Does Positronium Form in the Universe? Reviewed Open Access

Takeshi Chiba, Naoshi Sugiyama

JCAP Vol. 06 page： 003 2004

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