Organization
Graduate School of Science Lecturer
Graduate School
Graduate School of Science
Undergraduate School
School of Science Department of Physics
Title
Lecturer
YOO Chulmoon
Degree 1
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PhD （ 2007.3 Osaka City University ）
Research Areas 1
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Others / Others / 相対論的宇宙論
Current Research Project and SDGs 1
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Primordial Black Hole
Committee Memberships 2
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理論天文学宇宙物理学懇談会 運営委員
2019.12 - 2019.11
Committee type：Academic society
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日本物理学会 宇宙線宇宙物理領域領域委員
2019.10 - 2021.9
Committee type：Academic society
Papers 85
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Turbulence on open string worldsheets under non-integrable boundary conditions Reviewed
Takaaki Ishii, Ryo Kitaku, Keiju Murata, Chul-Moon Yoo
Journal of high energy physics ( 2 ) 2024.2
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Revisiting compaction functions for primordial black hole formation Reviewed
Harada, T; Yoo, CM; Koga, Y
PHYSICAL REVIEW D Vol. 108 ( 4 ) 2023.8
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Spins of primordial black holes formed with a soft equation of state Reviewed
Daiki Saito, Tomohiro Harada, Yasutaka Koga, Chul-Moon Yoo
Journal of Cosmology and Astroparticle Physics Vol. 07 ( 030 ) 2023.7
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Stationary vacuum bubble in a Kerr-de Sitter spacetime Reviewed
Saito, D; Yoo, CM
PHYSICAL REVIEW D Vol. 107 ( 6 ) 2023.3
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Einstein-Vlasov system with equal-angular momenta in AdS5 Reviewed
Asami, H; Yoo, CM; Kitaku, R; Uemichi, K
PHYSICAL REVIEW D Vol. 107 ( 6 ) 2023.3
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Testing the non-circularity of the spacetime around Sagittarius A* with orbiting pulsars Reviewed
Takamori, Y; Naruko, A; Sakurai, Y; Takahashi, K; Yamauchi, D; Yoo, CM
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 75 page： S217 - S231 2023.2
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Threshold of primordial black hole formation against velocity dispersion in matter-dominated era Reviewed
Harada, T; Kohri, K; Sasaki, M; Terada, T; Yoo, CM
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 2 ) 2023.2
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The Basics of Primordial Black Hole Formation and Abundance Estimation Invited Reviewed
Yoo, CM
GALAXIES Vol. 10 ( 6 ) 2022.12
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Effective Inspiral Spin Distribution of Primordial Black Hole Binaries Reviewed
Koga, Y; Harada, T; Tada, Y; Yokoyama, S; Yoo, CM
ASTROPHYSICAL JOURNAL Vol. 939 ( 2 ) 2022.11
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Gravothermal catastrophe and critical dimension in a D-dimensional asymptotically AdS spacetime Reviewed
Asami, H; Yoo, CM
PHYSICAL REVIEW D Vol. 106 ( 4 ) 2022.8
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Primordial black hole formation from massless scalar isocurvature Reviewed
Yoo, CM; Harada, T; Hirano, S; Okawa, H; Sasaki, M
PHYSICAL REVIEW D Vol. 105 ( 10 ) 2022.5
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Simulation of primordial black holes with large negative non-Gaussianity Reviewed International coauthorship
Escrivá, A; Tada, Y; Yokoyama, S; Yoo, CM
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 5 ) 2022.5
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Testing the non-circularity of the spacetime around Sagittarius A* with orbiting pulsars Reviewed
Yohsuke Takamori, Atsushi Naruko, Yusuke Sakurai, Keitaro Takahashi, Daisuke Yamauchi, Chul-Moon Yoo
Publications of the Astronomical Society of Japan 2022.3
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Axion cloud decay due to the axion-photon conversion with background magnetic fields Reviewed
Yoo, CM; Naruko, A; Sakurai, Y; Takahashi, K; Takamori, Y; Yamauchi, D
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 74 ( 1 ) page： 64 - 72 2022.2
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False vacuum decay in rotating BTZ spacetimes Reviewed
Saito, D; Yoo, CM
PHYSICAL REVIEW D Vol. 104 ( 12 ) 2021.12
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Primordial black holes in peak theory with a non-Gaussian tail Reviewed
Kitajima, N; Tada, Y; Yokoyama, S; Yoo, CM
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 10 ) 2021.10
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Asami Hiroki, Yoo Chul-Moon
CLASSICAL AND QUANTUM GRAVITY Vol. 38 ( 16 ) 2021.8
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The first-order symmetry operator on gravitational perturbations in the 5D Myers–Perry spacetime with equal angular momenta Reviewed
Masataka Tsuchiya, Tsuyoshi Houri, Chul-Moon Yoo
Progress of Theoretical and Experimental Physics Vol. 2021 ( 3 ) 2021.2
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Spins of Primordial Black Holes Formed in the Radiation-dominated Phase of the Universe: First-order Effect Reviewed
Harada Tomohiro, Yoo Chul-Moon, Kohri Kazunori, Koga Yasutaka, Monobe Takeru
ASTROPHYSICAL JOURNAL Vol. 908 ( 2 ) 2021.2
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Dynamical analysis of screening in scalar-tensor theory Reviewed
PHYSICAL REVIEW D Vol. 103 ( 2 ) 2021.1
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Abundance of Primordial Black Holes in Peak Theory for an Arbitrary Power Spectrum Reviewed
Chul-Moon Yoo, Tomohiro Harada, Shin'ichi Hirano, Kazunori Kohri
Progress of Theoretical and Experimental Physics Vol. 2021 ( 013E02 ) 2020.10
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Sonic point and photon surface Reviewed
Tsuchiya Masataka, Yoo Chul-Moon, Koga Yasutaka, Harada Tomohiro
PHYSICAL REVIEW D Vol. 102 ( 4 ) 2020.8
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Threshold of primordial black hole formation in nonspherical collapse Reviewed
Yoo Chul-Moon, Harada Tomohiro, Okawa Hirotada
PHYSICAL REVIEW D Vol. 102 ( 4 ) 2020.8
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Resolving a spacetime singularity with field transformations Reviewed
Naruko Atsushi, Yoo Chul-Moon, Sasaki Misao
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2020 ( 4 ) 2020.4
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Abundance of primordial black holes with local non-Gaussianity in peak theory
Yoo Chul-Moon, Gong Jinn-Ouk, Yokoyama Shuichiro
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 9 ) 2019.9
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Constant-mean-curvature slicing of the Swiss-cheese universe
Yoo Chul-Moon, Nakao Ken-ichi
GENERAL RELATIVITY AND GRAVITATION Vol. 51 ( 9 ) 2019.9
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Gravitational collapse of a massless scalar field in a periodic box
Yoo Chul-Moon, Ikeda Taishi, Okawa Hirotada
CLASSICAL AND QUANTUM GRAVITY Vol. 36 ( 7 ) 2019.4
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Gravastar formation: What can be the evidence of a black hole?
Nakao, K; Yoo, CM; Harada, T
PHYSICAL REVIEW D Vol. 99 ( 4 ) 2019.2
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Chameleon field in a spherical shell system
Nakamura, T; Ikeda, T; Saito, R; Yoo, CM
PHYSICAL REVIEW D Vol. 99 ( 4 ) 2019.2
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Yoo, CM; Harada, T; Garriga, J; Kohri, K
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2018 ( 12 ) 2018.12
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Rigidly rotating string sticking in a Kerr black hole
Igata, T; Ishihara, H; Tsuchiya, M; Yoo, CM
PHYSICAL REVIEW D Vol. 98 ( 6 ) 2018.9
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Remarks on the maximum luminosity
Cardoso, V; Ikeda, T; Moore, CJ; Yoo, CM
PHYSICAL REVIEW D Vol. 97 ( 8 ) 2018.4
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Observational constraint on spherical inhomogeneity with CMB and local Hubble parameter
Tokutake, M; Ichiki, K; Yoo, CM
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS ( 3 ) 2018.3
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Spins of primordial black holes formed in the matter-dominated phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri, Ken-ichi Nakao
Physical Review D Vol. 96 ( 8 ) page： 083517 2017.10
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Self-gravitating oscillons and new critical behavior
Taishi Ikeda, Chul-Moon Yoo, Vitor Cardoso
Physical Review D Vol. 96 ( 6 ) page： 064047 2017.9
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3D Simulation of Spindle Gravitational Collapse of a Collisionless Particle System Reviewed
Chul-Moon Yoo, Tomohiro Harada, Hirotada Okawa
Classical and Quantum Gravity Vol. 34 ( 10 ) page： 105010 2017.5
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Critical Behavior of a Spherically Symmetric Domain Wall Collapse
Taishi Ikeda, Chul-Moon Yoo
Physical Review D Vol. 94 page： 124032 2016.12
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Primordial Black Hole Formation in the Matter-dominated Phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri, Ken-ichi Nakao, Jhingan Sanjay
Astrophysical Journal Vol. 833 page： 124032 2016.12
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Inverse Construction of the Lambda-LTB Model from a Distance-Redshift Relation Reviewed
Masato Tokutake, Chul-Moon Yoo
Jounal of Cosmology and Astroparticle Physics Vol. 1610 page： 009 2016.10
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Another Approach to Test Gravity around a Black Hole Reviewed
Kengo Iwata, Chul-Moon Yoo
Classical and Quantum Gravity Vol. 33 page： 155007 2016.7
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Relationship between the CMB, Sunyaev-Zel'dovich cluster counts, and local Hubble parameter measurements in a simple void model Reviewed
Kiyotomo Ichiki, Chul-Moon Yoo, Masamune Oguri
Phys. Rev. D Vol. 93 ( 2 ) page： 023529 2016
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Impact of small scale inhomogeneities on observations of standard candles Reviewed
Kengo Iwata, Chul-Moon Yoo
Europhys. Lett. Vol. 109 ( 3 ) page： 39001 2015
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Expanding universe with nonlinear gravitational waves Reviewed
Taishi Ikeda, Chul-Moon Yoo, Yasusada Nambu
Phys. Rev. D Vol. 92 ( 4 ) page： 044041 2015
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Systematic error due to isotropic inhomogeneities Reviewed
Hiroyuki Negishi, Ken-ichi Nakao, Chul-Moon Yoo, Ryusuke Nishikawa
Phys. Rev. D Vol. 92 ( 10 ) page： 103003 2015
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Cosmological long-wavelength solutions and primordial black hole formation
Tomohiro Harada, Chul-Moon Yoo, Tomohiro Nakama, Yasutaka Koga
Phys. Rev. D Vol. 91 ( 8 ) page： 084057 2015
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Maximum mass of a barotropic spherical star Reviewed
Atsuhito Fujisawa, Hiromi Saida, Chul-Moon Yoo, Yasusada Nambu
Class. Quant. Grav. Vol. 32 ( 21 ) page： 215028 2015
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Spherical Domain Wall Collapse in a Dust Universe Reviewed
Norihiro Tanahashi, Chul-Moon Yoo
Class. Quant. Grav. Vol. 32 ( 15 ) page： 155003 2015
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Black Hole Universe with Λ Reviewed
Chul-Moon Yoo, Hirotada Okawa
Physical Review D Vol. 89 page： 123502 2014
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Comparison of two approximation schemes for solving perturbations in a Lemaître-Tolman-Bondi cosmological model Reviewed
Ryusuke Nishikawa, Ken-ichi Nakao, Chul-Moon Yoo
Phys. Rev. D ( 90 ) page： 107301 2014
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Femto-lensing due to a Cosmic String Reviewed
Chul-Moon Yoo, Ryo Saito, Yuuiti Sendouda, Keitaro Takahashi, Daisuke Yamauchi
PTEP Vol. 2013 page： 013E01 2013
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Wave Effect in Gravitational Lensing by the Ellis Wormhole Reviewed
Chul-Moon Yoo, Tomohiro Harada, Naoki Tsukamoto
Phys. Rev. D Vol. 87 page： 084045 2013
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Black Hole Universe: Time Evolution Reviewed
Chul-Moon Yoo, Hirotada Okawa, Ken-ichi Nakao
Phys. Rev. Lett. Vol. 111 page： 161102 2013
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Threshold of primordial black hole formation
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri
Physical Review D Vol. 88 ( 8 ) page： 084051 2013
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Type-I cosmic string network Reviewed
Takashi Hiramatsu, Yuuiti Sendouda, Keitaro Takahashi, Daisuke Yamauchi, Chul-Moon Yoo
Physical Review D Vol. 88 page： 085021 2013
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Two-point correlation function of density perturbations in a large void universe Reviewed
Ryusuke Nishikawa, Chul-Moon Yoo, Ken-ichi Nakao
Physical Review D Vol. 88 page： 123520 2013
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Notes on Spinoptics in a Stationary Spacetime Reviewed
Chul-Moon Yoo
Phys. Rev. D Vol. 86 page： 084005 2012
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宇宙原理の観測的検証
柳 哲文， 中尾憲一
日本物理学会誌 Vol. 67 page： 37 2012
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Weak lensing of CMB by cosmic (super-)strings Reviewed
Daisuke Yamauchi, Keitaro Takahashi, Yuuiti Sendouda, Chul-Moon Yoo
Phys. Rev. D Vol. 85 page： 103515 2012
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Direct Measurement of the Positive Acceleration of the Universe and Testing Inhomogeneous Models under Gravitational Wave Cosmology Reviewed
Kent Yagi, Atsushi Nishizawa, Chul-Moon Yoo
JCAP Vol. 1204 page： 031 2012
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Evolution of density perturbations in large void universe Reviewed
Ryusuke Nishikawa, Chul-Moon Yoo, Ken-ichi Nakao
Phys. Rev. D Vol. 85 page： 103511 2012
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Black Hole Universe: Construction and Analysis of Initial Data Reviewed
Chul-Moon Yoo, Hiroyuki Abe, Ken-ichi Nakao, Yohsuke Takamori
Phys. Rev. D Vol. 86 page： 044027 2012
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Gregory-Laflamme instability of a slowly rotating black string Reviewed
Chul-Moon Yoo, Sugure Tanzawa, Misao Sasaki
Int. J. Mod. Phys. D Vol. 20 page： 963 2011
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Redshift Drift in LTB Void Universes Reviewed
Chul-Moon Yoo, Tomohiro Kai, Ken-ichi Nakao
Phys. Rev. D Vol. 83 page： 043527 2011
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Perturbative Analysis of a Stationary Magnetosphere in an Extreme Black Hole Spacetime : On the Meissner-like Effect of an Extreme Black Hole Reviewed
Yohsuke Takamori, Ken-ichi Nakao, Hideki Ishihara, Masashi Kimura, Chul-Moon Yoo
Mon. Not. Roy. Astron. Soc. Vol. 412 page： 2417 2011
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A Note on the Inverse Problem with LTB Universes Reviewed
Chul-Moon Yoo
PTP Vol. 124 page： 645 2010
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Hoop Conjecture and the Horizon Formation Cross-Section in Kaluza-Klein Spacetimes Reviewed
Chul-moon Yoo, Hideki Ishihara, Masashi Kimura, Sugure Tanzawa
Phys. Rev. D Vol. 81 page： 024020 2010
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Another Realization of Kerr/CFT Correspondence Reviewed
Yoshinori Matsuo, Takuya Tsukioka, Chul-Moon Yoo
Nucl. Phys. B Vol. 825 page： 231 2010
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Yet Another Realization of Kerr/CFT Correspondence Reviewed
Yoshinori Matsuo, Takuya Tsukioka, Chul-Moon Yoo
Europhys. Lett. Vol. 89 page： 60001 2010
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Skewness in CMB temperature fluctuations from curved cosmic (super-)strings Reviewed
Daisuke Yamauchi, Yuuiti Sendouda (Kyoto U., Yukawa Inst., Kyoto), Chul-Moon Yoo, Keitaro Takahashi, Atsushi Naruko, Misao Sasaki
JCAP Vol. 1005 page： 033 2010
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CMB observations in LTB universes: Part I: Matching peak positions in the CMB spectrum Reviewed
Chul-Moon Yoo, Ken-ichi Nakao, Misao Sasaki
JCAP Vol. 1007 page： 012 2010
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Analytical model for CMB temperature angular power spectrum from cosmic (super-)strings Reviewed
Daisuke Yamauchi, Keitaro Takahashi, Yuuiti Sendouda, Chul-Moon Yoo, Misao Sasaki
Phys. Rev. D Vol. 82 page： 063518 2010
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Notes on the Hidden Conformal Symmetry in the Near Horizon Geometry of the Kerr Black Hole Reviewed
Yoshinori Matsuo, Takuya Tsukioka, Chul-Moon Yoo
Nucl. Phys. B Vol. 844 page： 146 2010
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CMB observations in LTB universes: Part II -- the kSZ effect in an LTB universe Reviewed
Chul-Moon Yoo, Ken-ichi Nakao, Misao Sasaki
JCAP Vol. 1010 page： 011 2010
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Topology Changing Process of Coalescing Black Holes on Eguchi-Hanson Space Reviewed
Masashi Kimura, Hideki Ishihara, Shinya Tomizawa, Chul-Moon Yoo
Phys. Rev. D Vol. 80 page： 064030 2009
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Non-Gaussianity in Cosmic Microwave Background Temperature Fluctuations from Cosmic (Super-)Strings Reviewed
Keitaro Takahashi, Atsushi Naruko, Yuuiti Sendouda, Daisuke Yamauchi, Chul-Moon Yoo, Misao Sasaki
JCAP Vol. 0910 page： 003 2009
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Sound Modes in Holographic Hydrodynamics for Charged AdS Black Hole Reviewed
Yoshinori Matsuo, Sang-Jin Sin, Shingo Takeuchi, Takuya Tsukioka, Chul-Moon Yoo
Nucl. Phys. B Vol. 820 page： 593 2009
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Conformal Symmetry for Rotating D-branes Reviewed
Li-Ming Cao, Yoshinori Matsuo, Takuya Tsukioka, Chul-Moon Yoo
Phys. Lett. B Vol. 679 page： 390 2009
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Dynamical Compactification and Inflation in Einstein-Yang-Mills Theory with Higher Derivative Coupling Reviewed
Hironobu Kihara, Muneto Nitta, Misao Sasaki, Chul-Moon Yoo, Ignacio Zaballa
Phys. Rev. D Vol. 80 page： 066004 2009
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Solving Inverse Problem with Inhomogeneous Universe Reviewed
Chul-Moon Yoo, Tomohiro Kai, Ken-ichi Nakao
PTP Vol. 120 page： 937 2008
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Horizons of Coalescing Black Holes on Eguchi-Hanson Space Reviewed
Chul-Moon Yoo, Hideki Ishihara, Masashi Kimura, Ken Matsuno, Shinya Tomizawa
Class. Quant. Grav. Vol. 25 page： 195017 2008
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Magnification Probability Distribution Functions of Standard Candles in a Clumpy Universe Reviewed
Chul-Moon Yoo, Hideki Ishihara, Ken-ichi Nakao, Hideyuki Tagoshi
PTP Vol. 120 page： 961 2008
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Can inhomogeneties accelerate the cosmic volume expansion? Reviewed
Tomohiro Kai, Hiroshi Kozaki, Ken-ichi nakao, Yasusada Nambu, Chul-Moon Yoo
PTP Vol. 117 page： 229 2007
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Lensing effects on gravitational waves in a clumpy universe: effects of inhomogeneity on the distance-redshift relation Reviewed
Chul-Moon Yoo, Ken-ichi Nakao, Hiroshi Kozaki, Ryuichi Takahashi
Astrophys. J. Vol. 655 page： 691 2007
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Quasinormal ringing for acoustic black holes at low temperature Reviewed
Hiroyuki Nakano, Yasunari Kurita, Kouji Ogawa, Chul-Moon Yoo
Phys. Rev. D Vol. 71 page： 084006 2005
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Hoop conjecture in five-dimensions: Violation of cosmic censorship Reviewed
Chul-Moon Yoo, Ken-ichi Nakao, Daisuke Ida
Phys. Rev. D Vol. 71 page： 104014 2005
Presentations 20
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定常な質量降着のあるブラックホール時空中の天体の運動について
柳哲文
日本物理学会 2023年春季大会 2023.3.23
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Numerical simulation of primordial black hole formation Invited International conference
Chulmoon Yoo
68TH WORKSHOP ON GRAVITATIONAL WAVES AND NUMERICAL RELATIVITY 2023.3.15
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Simulation of non-spherical PBH formation with mesh-refinenment Invited International conference
Chulmoon Yoo
Dynamics of primordial black hole formation 2023.3.11
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Spacetime structure of type II PBH formation International conference
Chulmoon Yoo
2023 Winter-II NRF-JSPS Workshop in particle physics, cosmology, and gravitation 2023.2.8
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格子細分化法を用いた非球対称PBH形成シミュレーション
柳哲文
第２３回特異点研究会 2022.12.30
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Simulation of primordial black hole formation Invited International conference
Chulmoon Yoo
The 4th Workshop on Multi-Messenger Astrophysics and Gravitation (MMAG) 2022.11.18
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Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era International conference
The 31st Workshop on General Relativity and Gravitation in Japan 2022.10.26
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物質優勢期の原始ブラックホール形成における速度分散の影響について
柳哲文
日本物理学会（秋） 2022.9
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The basics of primordial black hole formation and its application Invited
The 34th Regular Meeting of the New Higgs Working Group online 2022.8
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Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era International conference
2022 Summer NRF-JSPS Workshop in particle physics, cosmology, and gravitation 2022.7
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うまくいかない宇宙ひも研究～石原さんの研究に魅せられて～ Invited
柳哲文
相対論と重力研究の現在，過去・未来
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The basics of primordial black hole formation and its application Invited International conference
Asia-Pacific School and Workshop on Gravitation and Cosmology 2022
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Simulation of PBH formation from isocurvature perturbations
柳哲文
日本物理学会（春）
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Simulation of PBH formation from iso-curvature perturbations Invited International conference
2022 NRF-JSPS Workshop in particle physics, cosmology
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多重極磁場中でのアクシオン光子転換に伴うアクシオン雲の崩壊率の計算
柳哲文
第２２回 特異点研究会
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Simulation of PBH formation from iso-curvature perturbations International conference
The 30th Workshop on General Relativity and Gravitaion in JAPAN
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Axion cloud decay due to the axion-photon conversion with background magnetic fields
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Axion cloud decay due to the axion-photon conversion with background magnetic fields Invited
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Axion Cloud Decay due to the Axion-photon Conversion with Background Magnetic Fields Invited International conference
2021 NRF-JSPS Workshop in particle physics, cosmology, and gravitation 2021.7
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Axion cloud decay due to the axion-photon conversion with background magnetic fields
KAKENHI (Grants-in-Aid for Scientific Research) 7
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Numerical exploration of new frontiers on primordial black hole formation
Grant number：22KF0168 2023.3 - 2025.3
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Authorship：Principal investigator
Grant amount：\1400000 （ Direct Cost: \1400000 ）
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Numerical exploration of new frontiers on primordial black hole formation
Grant number：22F22328 2022.11 - 2025.3
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Authorship：Other
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What is dark matter? - Comprehensive study of the huge discovery space in dark matter
Grant number：20H05850 2020.11 - 2025.3
Grant-in-Aid for Transformative Research Areas (A)
Authorship：Coinvestigator(s)
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原始ブラックホール・巨視的ダークマターの探究
Grant number：20H05853 2020.11 - 2025.3
学術変革領域研究(A)
柳 哲文
Authorship：Principal investigator
Grant amount：\57200000 （ Direct Cost: \44000000 、 Indirect Cost：\13200000 ）
原始ブラックホール(Primordial Black Hole:PBH) とは宇宙初期に形成されるブラックホールの総称である。本計画研究ではPBH に関するこれまでの理論的研究をより「深化」（精密化，精度向上）させると共に，標準的なPBH 形成過程を超えた幅広いモデルへの「拡張」を行い，過去，及び将来の観測による「検証」を提案し，徹底的にPBH のダークマターとしての可能性を精査する。また，PBHだけでなく，比較的コンパクトで巨視的な天体によるダークマターに関しても共通する点が多く，その可能性についても併せて検討する。
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原始ブラックホールの質量，角運動量分布に関する理論的研究
Grant number：19H01895 2019.4 - 2022.3
柳 哲文
Authorship：Principal investigator
Grant amount：\17420000 （ Direct Cost: \13400000 、 Indirect Cost：\4020000 ）
インフレーション中に生成された量子揺らぎを起源とする高密度領域が，宇宙初期に重力崩壊を起こした結果形成されるブラックホールを原始ブラックホール（PBH）と呼ぶ．PBH の存在量はその質量ごとに観測的制限が得られており，そこからインフレーションモデルを制限できる．また，近年は重力波源であるブラックホール連星の起源としても注目されている．本研究では初期揺らぎの統計性を素に，相対論的な非球対称重力崩壊シミュレーションを用いてPBH の質量，角運動量分布を明らかにする方法を提案する．
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Nonspherical primordial black hole formation
Grant number：16K17688 2016.4 - 2020.3
Yoo Chulmoon
Authorship：Principal investigator
Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）
Basic research for simulation of non-spherical primordial black hole formation has been performed, and the development led to the success in the simulation starting from a non-spherical realistic initial data for primordial black hole formation in the beginning of 2020 fiscal year.
The procedure of calculating primordial black hole abundance has been improved much, and it contributed to the progress in estimation of primordial black hole abundance. -
加速宇宙観測における等方な非一様性による系統誤差と宇宙原理の観測的検証
Grant number：16H01097 2016.4 - 2018.3
科学研究費助成事業 新学術領域研究(研究領域提案型)
柳 哲文
Authorship：Principal investigator
Grant amount：\2080000 （ Direct Cost: \1600000 、 Indirect Cost：\480000 ）
本研究では非一様球対称宇宙モデルを考え，我々はその中心にいるとして，そのような球対称な非一様性を観測からどれくらい制限がつけられるか，非一様性がどの程度の系統誤差を生じさせるかを明らかにすることである．
前年度に与えられた光度距離ー赤方偏移関係から，それを満たすΛLTBモデルを構築し，真の宇宙項の値と光度距離にパラメータとして含まれる見かけの宇宙項の値との差を埋めるためにはどの程度の非一様性が必要かを明らかにすることに成功した．
本年度は，このように構成されたモデルにおいて，宇宙背景放射の角度パワースペクトルを計算する手法を開発し，オープンコードと組み合わせることによって，実際に角度パワースペクトルを計算することができるようになった．具体的には光子の最終散乱面付近では十
分一様等方な状況が実現されているとし，最終散乱面付近における一様等方モデルのパラメータをΛLTBモデルから抽出し，それをオープンコードに入力することによって，仮想的な一様等方宇宙におけるパワースペクトルを得る．その後，最終散乱面までの角径距離の違いに伴う補正を行うことによって，ΛLTBモデルにおける宇宙背景放射のパワースペクトルを計算することができる．
このパワースペクトルと観測データを比較し，モンテカルロ解析を行って，モデルパラメータに制限を付け，結果が学術誌に掲載された．
また，これらの結果からつけられた制限の範囲内で，クラスターからのCMB光子の散乱についての解析を現在行っており，より強い制限がつくことを示唆する結果を得ている．これについては新学術領域シンポジウムで報告を行った．
29年度が最終年度であるため、記入しない。
29年度が最終年度であるため、記入しない。
Teaching Experience (On-campus) 2
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数理物理I
2022
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Physics Tutorial II
2020
Social Contribution 1
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「相対性理論」～重力波，ブラックホールの先端研究から～
Role(s)：Lecturer
河合塾 2021 河合塾文化講演会シリーズ 2021.8