2024/07/10 更新

写真a

テラダ タカヒロ
寺田 隆広
TERADA Takahiro
所属
素粒子宇宙起源研究所 基礎理論研究部門 特任助教
職名
特任助教
 

論文 43

  1. Quintessential interpretation of the evolving dark energy in light of DESI observations

    Tada Y., Terada T.

    Physical Review D   109 巻 ( 12 )   2024年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Physical Review D  

    The recent result of the Dark Energy Spectroscopic Instrument (DESI) in combination with other cosmological data shows evidence of the evolving dark energy parametrized by the w0waCDM model. We interpret this result in terms of a quintessential scalar field and demonstrate that it can explain the DESI result even though it becomes eventually phantom in the past. Relaxing the assumption on the functional form of the equation-of-state parameter w=w(a), we also discuss a more realistic quintessential model. The implications of the DESI result for Swampland conjectures, cosmic birefringence, and the fate of the Universe are discussed as well.

    DOI: 10.1103/PhysRevD.109.L121305

    Scopus

    arXiv

  2. Dissipative genesis of the inflationary universe

    Matsui, Hiroki, Papageorgiou, Alexandros, Takahashi, Fuminobu, Takahiro Terada

    Phys.Rev.D   109 巻 ( 10 )   2024年5月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.109.L101303

    arXiv

  3. Dissipative emergence of inflation from a quasicyclic universe

    Matsui, Hiroki, Papageorgiou, Alexandros, Takahashi, Fuminobu, Takahiro Terada

    Phys.Rev.D   109 巻 ( 10 ) 頁: 103523 - 103523   2024年5月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.109.103523

    arXiv

  4. Detected stochastic gravitational waves and subsolar-mass primordial black holes

    Keisuke Inomata, Kazunori Kohri, Takahiro Terada

    Phys.Rev.D   109 巻 ( 6 ) 頁: 063506 - 063506   2024年3月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.109.063506

    arXiv

  5. Cancellation of quantum corrections on the soft curvature perturbations

    Tada, Y; Terada, T; Tokuda, J

    JOURNAL OF HIGH ENERGY PHYSICS   01 巻 ( 1 ) 頁: 105 - 105   2024年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of High Energy Physics  

    We study the cancellation of quantum corrections on the superhorizon curvature perturbations from subhorizon physics beyond the single-clock inflation from the viewpoint of the cosmological soft theorem. As an example, we focus on the transient ultra-slow-roll inflation scenario and compute the one-loop quantum corrections to the power spectrum of curvature perturbations taking into account nontrivial surface terms in the action. We find that Maldacena’s consistency relation is satisfied and guarantees the cancellation of contributions from the short-scale modes. As a corollary, primordial black hole production in single-field inflation scenarios is not excluded by perturbativity breakdown even for the sharp transition case in contrast to some recent claims in the literature. We also comment on the relation between the tadpole diagram in the in-in formalism and the shift of the elapsed time in the stochastic-δN formalism. We find our argument is not directly generalisable to the tensor perturbations.

    DOI: 10.1007/JHEP01(2024)105

    Web of Science

    Scopus

    arXiv

  6. Induced gravitational waves with kination era for recent pulsar timing array signals

    Harigaya, Keisuke, Keisuke Inomata, Takahiro Terada

    Phys.Rev.D   108 巻 ( 12 ) 頁: 123538 - 123538   2023年12月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.108.123538

    arXiv

  7. Gravitational wave production from axion rotations right after a transition to kination

    Harigaya, Keisuke, Keisuke Inomata, Terada, Takahiro

    Phys.Rev.D   108 巻 ( 8 )   2023年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.108.L081303

    arXiv

  8. Inflationary α-attractor models with singular derivative of potential

    Kubota, Kei-ichiro, Matsui, Hiroki, Terada, Takahiro

    JCAP   07 巻   頁: 011 - 011   2023年7月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1475-7516/2023/07/011

    arXiv

  9. Threshold of primordial black hole formation against velocity dispersion in matter-dominated era

    Harada, T; Kohri, K; Sasaki, M; Terada, T; Yoo, CM

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   02 巻 ( 2 ) 頁: 038 - 038   2023年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Cosmology and Astroparticle Physics  

    We study the effects of velocity dispersion on the formation of primordial black holes (PBHs) in a matter-dominated era. The velocity dispersion is generated through the nonlinear growth of perturbations and has the potential to impede the gravitational collapse and thereby the formation of PBHs. To make discussions clear, we consider two distinct length scales. The larger one is where gravitational collapse occurs which could lead to PBH formation, and the smaller one is where the velocity dispersion develops due to nonlinear interactions. We estimate the effect of the velocity dispersion on the PBH formation by comparing the free-fall timescale and the timescale for a particle to cross the collapsing region. As a demonstration, we consider a log-normal power spectrum for the initial density perturbation with the peak value σ 02 at a scale that corresponds to the larger scale. We find that the threshold value of the density perturbation δ̃ th at the horizon entry for the PBH formation scales as δ̃ th ∝ σ 02/5 for σ 0 ≪ 1.

    DOI: 10.1088/1475-7516/2023/02/038

    Web of Science

    Scopus

    arXiv

  10. Constrained superfields in dynamical background

    Aoki, Shuntaro, Takahiro Terada

    JHEP   02 巻   頁: 177 - 177   2022年2月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP02(2022)177

    arXiv

  11. Massless preheating and electroweak vacuum metastability

    Kost, Jeff, Shin, Chang Sub, Terada, Takahiro

    Phys.Rev.D   105 巻 ( 4 ) 頁: 043508 - 043508   2022年2月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.105.043508

    arXiv

  12. Minimal supergravity inflation without slow gravitino

    Terada, Takahiro

    Phys.Rev.D   103 巻 ( 12 ) 頁: 125022 - 125022   2021年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.103.125022

    arXiv

  13. Solar-Mass Primordial Black Holes Explain NANOGrav Hint of Gravitational Waves

    Kohri, Kazunori, Takahiro Terada

    Phys.Lett.B   813 巻   頁: 136040 - 136040   2021年2月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2020.136040

    arXiv

  14. Swampland Constraints on No-Boundary Quantum Cosmology

    Hiroki Matsui, Terada, Takahiro

    JHEP   10 巻   頁: 162 - 162   2020年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP10(2020)162

    arXiv

  15. Gravitational Wave Production right after a Primordial Black Hole Evaporation

    Inomata, Keisuke, Kawasaki, Masahiro, Mukaida, Kyohei, Terada, Takahiro, Yanagida, Tsutomu T.

    Phys.Rev.D   101 巻 ( 12 ) 頁: 123533 - 123533   2020年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.101.123533

    arXiv

  16. Gauge Independence of Induced Gravitational Waves

    Inomata, Keisuke, Terada, Takahiro

    Phys.Rev.D   101 巻 ( 2 ) 頁: 023523 - 023523   2020年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.101.023523

    arXiv

  17. Trans-Planckian censorship and single-field inflaton potential

    Kadota, Kenji, Shin, Chang Sub, Terada, Takahiro, Tumurtushaa, Gansukh

    JCAP   01 巻 ( 01 ) 頁: 008 - 008   2020年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1475-7516/2020/01/008

    arXiv

  18. Clustering of primordial black holes formed in a matter-dominated epoch

    Matsubara, T; Terada, T; Kohri, K; Yokoyama, S

    PHYSICAL REVIEW D   100 巻 ( 12 ) 頁: 123544 - 123544   2019年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Physical Review D  

    In the presence of the local-type primordial non-Gaussianity, it is known that the clustering of primordial black holes (PBHs) emerges even on superhorizon scales at the formation time. This effect has been investigated in the high-peak limit of the PBH formation in the radiation-dominated epoch in the literature. There is another possibility that the PBH formation takes place in the early matter-dominated epoch. In this scenario, the high-peak limit is not applicable because even initially small perturbations grow and can become a PBH. We first derive a general formula to estimate the clustering of PBHs with primordial non-Gaussianity without assuming the high-peak limit and then apply this formula to a model of PBH formation in a matter-dominated epoch. Clustering is less significant in the case of the PBH formation in the matter-dominated epoch than that in the radiation-dominated epoch. Nevertheless, it is much larger than the Poisson shot noise in many cases. Relations to the constraints of the isocurvature perturbations by the cosmic microwave background radiation are quantitatively discussed.

    DOI: 10.1103/PhysRevD.100.123544

    Web of Science

    Scopus

    arXiv

  19. Gravitational Waves Induced by Scalar Perturbations during a Gradual Transition from an Early Matter Era to the Radiation Era

    Inomata, Keisuke, Kohri, Kazunori, Nakama, Tomohiro, Terada, Takahiro

    JCAP   10 巻   頁: 071 - 071   2019年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1475-7516/2019/10/071

    arXiv

  20. Enhancement of Gravitational Waves Induced by Scalar Perturbations due to a Sudden Transition from an Early Matter Era to the Radiation Era

    Keisuke Inomata, Kohri, Kazunori, Nakama, Tomohiro, Terada, Takahiro

    Phys.Rev.D   100 巻   頁: 043532 - 043532   2019年8月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.108.049901

    arXiv

  21. Non-singular bouncing cosmology with positive spatial curvature and flat scalar potential

    Matsui, Hiroki, Takahashi, Fuminobu, Takahiro Terada

    Phys.Lett.B   795 巻   頁: 152 - 159   2019年8月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2019.06.013

    arXiv

  22. Prospective constraints on the primordial black hole abundance from the stochastic gravitational-wave backgrounds produced by coalescing events and curvature perturbations

    Wang, Sai, Terada, Takahiro, Kohri, Kazunori

    Phys.Rev.D   99 巻 ( 10 ) 頁: 103531 - 103531   2019年5月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.99.103531

    arXiv

  23. Primordial Black Hole Dark Matter and LIGO/Virgo Merger Rate from Inflation with Running Spectral Indices: Formation in the Matter- and/or Radiation-Dominated Universe

    Kohri, Kazunori, Takahiro Terada

    Class.Quant.Grav.   35 巻 ( 23 ) 頁: 235017 - 235017   2018年11月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1361-6382/aaea18

    arXiv

  24. Unitarity constraint on the Kähler curvature

    Ema, Yohei, Kitano, Ryuichiro, Terada, Takahiro

    JHEP   09 巻   頁: 075 - 075   2018年9月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP09(2018)075

    arXiv

  25. Semianalytic calculation of gravitational wave spectrum nonlinearly induced from primordial curvature perturbations

    Kohri, Kazunori, Terada, Takahiro

    Phys.Rev.D   97 巻 ( 12 ) 頁: 123532 - 123532   2018年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.97.123532

    arXiv

  26. Gravitino problem in inflation driven by inflaton-polonyi Kähler coupling

    Hasegawa, Fuminori, Nakayama, Kazunori, Takahiro Terada, Yamada, Yusuke

    Phys.Lett.B   777 巻   頁: 270 - 274   2018年2月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2017.12.038

    arXiv

  27. Gravitino Problem in Minimal Supergravity Inflation

    Hasegawa, Fuminori, Mukaida, Kyohei, Nakayama, Kazunori, Takahiro Terada, Yamada, Yusuke

    Phys.Lett.B   767 巻   頁: 392 - 397   2017年4月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2017.02.030

    arXiv

  28. Curvaton as dark matter with secondary inflation

    Gong, Jinn-Ouk, Kitajima, Naoya, Terada, Takahiro

    JCAP   03 巻   頁: 053 - 053   2017年3月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1475-7516/2017/03/053

    arXiv

  29. Reinterpretation of the Starobinsky model

    Asaka, Takehiko, Iso, Satoshi, Kawai, Hikaru, Kohri, Kazunori, Noumi, Toshifumi, Takahiro Terada

    PTEP   2016 巻 ( 12 )   2016年12月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1093/ptep/ptw161

    arXiv

  30. Nonthermal Gravitino Production after Large Field Inflation

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori, Terada, Takahiro

    JHEP   11 巻   頁: 184 - 184   2016年11月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP11(2016)184

    arXiv

  31. Generalized Pole Inflation: Hilltop, Natural, and Chaotic Inflationary Attractors

    Terada, Takahiro

    Phys.Lett.B   760 巻   頁: 674 - 680   2016年9月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2016.07.058

    arXiv

  32. On SUSY Restoration in Single-Superfield Inflationary Models of Supergravity

    Ketov, Sergei V., Terada, Takahiro

    Eur.Phys.J.C   76 巻 ( 8 ) 頁: 438 - 438   2016年8月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1140/epjc/s10052-016-4283-6

    arXiv

  33. Testing ATLAS Z+MET Excess with LHC Run 2

    Lu, Xiaochuan, Shirai, Satoshi, Terada, Takahiro

    JHEP   05 巻   頁: 108 - 108   2016年5月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP05(2016)108

    arXiv

  34. Structure of Kähler potential for D-term inflationary attractor models

    Nakayama, Kazunori, Saikawa, Ken'ichi, Terada, Takahiro, Yamaguchi, Masahide

    JHEP   05 巻   頁: 067 - 067   2016年5月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP05(2016)067

    arXiv

  35. Single-Superfield Helical-Phase Inflation

    Ketov, Sergei V., Terada, Takahiro

    Phys.Lett.B   752 巻   頁: 108 - 112   2016年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2015.11.039

    arXiv

  36. ATLAS $Z$ Excess in Minimal Supersymmetric Standard Model

    Lu, Xiaochuan, Shirai, Satoshi, Terada, Takahiro

    JHEP   09 巻   頁: 204 - 204   2015年9月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP09(2015)204

    arXiv

  37. Reheating processes after Starobinsky inflation in old-minimal supergravity

    Terada, Takahiro, Watanabe, Yuki, Yamada, Yusuke, Yokoyama, Jun'ichi

    JHEP   02 巻   頁: 105 - 105   2015年2月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP02(2015)105

    arXiv

  38. Generic Scalar Potentials for Inflation in Supergravity with a Single Chiral Superfield

    Ketov, Sergei V., Terada, Takahiro

    JHEP   12 巻   頁: 062 - 062   2014年12月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP12(2014)062

    arXiv

  39. Inflation in supergravity with a single chiral superfield

    Ketov, Sergei V., Terada, Takahiro

    Phys.Lett.B   736 巻   頁: 272 - 277   2014年9月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2014.07.036

    arXiv

  40. Complexified Starobinsky Inflation in Supergravity in the Light of Recent BICEP2 Result

    Hamaguchi, Koichi, Moroi, Takeo, Terada, Takahiro

    Phys.Lett.B   733 巻   頁: 305 - 308   2014年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.physletb.2014.05.006

    arXiv

  41. Old-minimal supergravity models of inflation

    Ketov, Sergei V., Terada, Takahiro

    JHEP   12 巻   頁: 040 - 040   2013年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP12(2013)040

    arXiv

  42. New Actions for Modified Gravity and Supergravity

    Ketov, Sergei V., Terada, Takahiro

    JHEP   07 巻   頁: 127 - 127   2013年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/JHEP07(2013)127

    arXiv

  43. Scalar Decay into Gravitinos in the Presence of D-term SUSY Breaking

    Endo, Motoi, Hamaguchi, Koichi, Terada, Takahiro

    Phys.Rev.D   86 巻   頁: 083543 - 083543   2012年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1103/PhysRevD.86.083543

    arXiv

▼全件表示

MISC 3

  1. The International Linear Collider: Report to Snowmass 2021

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Peskin, Roman Poeschl, Sam Posen, Aidan Robson, Jan Strube, Taikan Suehara, Junping Tian, Maxim Titov, Marcel Vos, Andrew White, Graham Wilson, Kaoru Yokoya, Aleksander Filip Zarnecki, Ichiro Adachi, Kaustubh Agashe, Tatjana Agatonovic Jovin, Hiroaki Aihara, Wolfgang Altmannshofer, Daniele Alves, Justin Anguiano, Ken-Ichi Aoki, Masato Aoki, Toshihiro Aoki, Yumi Aoki, Yasuo Arai, Hayato Araki, Haruka Asada, Kento Asai, Shoji Asai, David Attie, Howard Baer, Jonathan Bagger, Yang Bai, Ian Bailey, Ricardo Barrue, Rainer Bartoldus, Emanuela Barzi, Matthew Basso, Lothar Bauerdick, Sebastian Baum, Alain Bellerive, Sergey Belomestnykh, Jorge Berenguer Antequera, Jakob Beyer, Pushpalatha Bhat, Burak Bilki, Kevin Black, Kenneth Bloom, Geoffrey Bodwin, Veronique Boisvert, Fatma Boran, Vincent Boudry, Radja Boughezal, Antonio Boveia, Ivanka Bozovic-Jelisavcic, Jean-Claude Brient, Stanley Brodsky, Laurent Brunetti, Karsten Buesser, Eugene Bulyak, Philip N. Burrows, Graeme C. Burt, Yunhai Cai, Valentina Cairo, Anadi Canepa, Francesco Giovanni Celiberto, Enrico Cenni, Zackaria Chacko, Iryna Chaikovska, Mattia Checchin, Lisong Chen, Thomas Y. Chen, Hsin Chia Cheng, Gi-Chol Cho, Brajesh Choudhary, Jim Clarke, James Cline, Raymond Co, Timothy Cohen, Paul Colas, Chris Damerell, Arindam Das, Sridhara Dasu, Sally Dawson, Jorge de Blas, Carlos Henrique de Lima, Aldo Deandrea, Klaus Dehmelt, Jean Delayen, Carlos Henrique de Lima, Marcel Demarteau, Dmitri Denisov, Radovan Dermisek, Angel Dieguez, Takeshi Dohmae, Jens Dopke, Katharina Dort, Yong Du, Bohdan Dudar, Bhaskar Dutta, Juhi Dutta, Ulrich Einhaus, Eckhard Elsen, Motoi Endo, Grigory Eremeev, Engin Eren, Jens Erler, Eric Esarey, Lisa Everett, Angeles Faus Golfe, Marcos Fernandez Garcia, Brian Foster, Nicolas Fourches, Mary-Cruz Fouz, Keisuke Fujii, Junpei Fujimoto, Esteban Fullan Torregrosa, Kazuro Furukawa, Takahiro Fusayasu, Juan Fuster, Serguei Ganjour, Yuanning Gao, Naveen Gaur, Rongli Geng, Howard Georgi, Tony Gherghetta, Joel Goldstein, Dorival Goncalves, Julia Gonski, Tomas Gonzalo, Takeyoshi Goto, Toru Goto, Norman Graf, Joseph Grames, Paul Grannis, Lindsey Gray, Alexander Grohsjean, Jiayin Gu, Yalcin Guler, Phillip Gutierrez, Junji Haba, Howard Haber, John Hallford, Koichi Hamaguchi, Tao Han, Kazuhiko Hara, Daisuke Harada, Koji Hashimoto, Katsuya Hashino, Masahito Hayashi, Gudrun Heinrich, Keisho Hidaka, Takeo Higuchi, Fujio Hinode, Zenro Hioki, Minoru Hirose, Nagisa Hiroshima, Junji Hisano, Wolfgang Hollik, Samuel Homiller, Sungwoo Hong, Anson Hook, Yasuyuki Horii, Hiroki Hoshina, Ivana Hristova, Katri Huitu, Yoshifumi Hyakutake, Toru Iijima, Katsumasa Ikematsu, Anton Ilderton, Kenji Inami, Adrian Irles, Akimasa Ishikawa, Koji Ishiwata, Hayato Ito, Igor Ivanov, Sho Iwamoto, Toshiyuki Iwamoto, Masako Iwasaki, Yoshihisa Iwashita, Haoyi Jia, Fabricio Jimenez Morales, Prakash Joshi, Sunghoon Jung, Goran Kacarevic, Michael Kagan, Mitsuru Kakizaki, Jan Kalinowski, Jochen Kaminski, Kazuyuki Kanaya, Shinya Kanemura, Hayato Kanno, Yuya Kano, Shigeru Kashiwagi, Yukihiro Kato, Nanami Kawada, Shin-ichi Kawada, Kiyotomo Kawagoe, Valery Khoze, Hiromichi Kichimi, Doojin Kim, Teppei Kitahara, Ryuichiro Kitano, Jan Klamka, Sachio Komamiya, K. C. Kong, Taro Konomi, Katsushige Kotera, Emi Kou, Ilya Kravchenko, Kiyoshi Kubo, Takayuki Kubo, Takuya Kumaoka, Ashish Kumar, Nilanjana Kumar, Jonas Kunath, Saumyen Kundu, Hiroshi Kunitomo, Masakazu Kurata, Masao Kuriki, Alexander Kusenko, Theodota Lagouri, Andrew J. Lankford, Gordana Lastovicka-Medin, Francois Le Diberder, Claire Lee, Matthias Liepe, Jacob Linacre, Zachary Liptak, Shivani Lomte, Ian Low, Yang Ma, Hani Maalouf, David MacFarlane, Brendon Madison, Thomas Madlener, Tomohito Maeda, Paul Malek, Sanjoy Mandal, Thomas Markiewicz, John Marshall, Aurelien Martens, Victoria Martin, Martina Martinello, Celso Martinez Rivero, Nobuhito Maru, John Matheson, Shigeki Matsumoto, Hiroyuki Matsunaga, Yutaka Matsuo, Kentarou Mawatari, Johnpaul Mbagwu, Peter McIntosh, Peter McKeown, Patrick Meade, Krzysztof Mekala, Petra Merkel, Satoshi Mihara, Víctor Miralles, Marcos Miralles Lopez, Go Mishima, Satoshi Mishima, Bernhard Mistlberger, Alexander Mitov, Kenkichi Miyabayashi, Akiya Miyamoto, Gagan Mohanty, Laura Monaco, Myriam Mondragon, Hugh E. Montgomery, Gudrid Moortgat-Pick, Nicolas Morange, María Moreno Llacer, Stefano Moretti, Toshinori Mori, Toshiyuki Morii, Takeo Moroi, David Morrissey, Benjamin Nachman, Kunihiro Nagano, Jurina Nakajima, Eiji Nakamura, Shinya Narita, Pran Nath, Timothy Nelson, David Newbold, Atsuya Niki, Yasuhiro Nishimura, Eisaku Nishiyama, Yasunori Nomura, Kacper Nowak, Mitsuaki Nozaki, María Teresa Nunez Pardo de Vera, Ines Ochoa, Masahito Ogata, Satoru Ohashi, Hikaru Ohta, Shigemi Ohta, Norihito Ohuchi, Hideyuki Oide, Nobuchika Okada, Yasuhiro Okada, Shohei Okawa, Yuichi Okayasu, Yuichi Okugawa, Toshiyuki Okugi, Takemichi Okui, Yoshitaka Okuyama, Mathieu Omet, Tsunehiko Omori, Hiroaki Ono, Tomoki Onoe, Wataru Ootani, Hidetoshi Otono, Shuhei Ozawa, Simone Pagan Griso, Alessandro Papa, Rocco Paparella, Eun-Kyung Park, Gilad Perez, Abdel Perez-Lorenzana, Yvonne Peters, Frank Petriello, Jonatan Piedra, Werner Porod, Christopher Potter, Alan Price, Yasser Radkhorrami, Laura Reina, Juergen Reuter, Francois Richard, Sabine Riemann, Robert Rimmer, Thomas Rizzo, Tania Robens, Roger Ruber, Alberto Ruiz Jimeno, Takayuki Saeki, Ipsita Saha, Tomoyuki Saito, Makoto Sakaguchi, Tadakatsu Sakai, Yasuhito Sakaki, Kodai Sakurai, Riccardo Salvatico, Fabrizio Salvatore, Yik Chuen San, Pearl Sandick, Tomoyuki Sanuki, Kollassery Swathi Sasikumar, Oliver Schaefer, Ruth Schaefer, Uwe Schneekloth, Thomas Schoerner-Sadenius, Carl Schroeder, Philip Schuster, Ariel Schwartzman, Reinhard Schwienhorst, Felix Sefkow, Yoshihiro Seiya, Motoo Sekiguchi, Kazuyuki Sekizawa, Katsumi Senyo, Hale Sert, Danielev Sertore, Ronald Settles, Qaisar Shafi, Tetsuo Shahdara, Barmak Shams Es Haghi, Ashish Sharma, Jessie Shelton, Claire Shepherd-Themistocleous, Hiroto Shibuya, Tetsuo Shidara, Takashi Shimomura, Tetsuo Shindou, Yutaro Shoji, Jing Shu, Ian Sievers, Frank Simon, Rajeev Singh, Yotam Soreq, Marcel Stanitzki, Steinar Stapnes, Amanda Steinhebel, John Stupak, Shufang Su, Fumihiko Suekane, Akio Sugamoto, Yuji Sugawara, Satoru Sugimoto, Yasuhiro Sugimoto, Hiroaki Sugiyama, Yukinari Sumino, Raman Sundrum, Atsuto Suzuki, Shin Suzuki, Maximilian Swiatlowski, Tim M. P. Tait, Shota Takahashi, Tohru Takahashi, Tohru Takeshita, Michihisa Takeuchi, Yosuke Takubo, Tomohiko Tanabe, Philip Tanedo, Morimitsu Tanimoto, Shuichiro Tao, Xerxes Tata, Toshiaki Tauchi, Geoffrey Taylor, Takahiro Terada, Nobuhiro Terunuma, Jesse Thaler, Alessandro Thea, Finn Tillinger, Jan Timmermans, Kohsaku Tobioka, Kouichi Toda, Atsushi Tokiyasu, Takashi Toma, Julie Torndal, Mehmet Tosun, Yu-Dai Tsai, Shih-Yen Tseng, Koji Tsumura, Douglas Tuckler, Yoshiki Uchida, Yusuke Uchiyama, Daiki Ueda, Fumihiko Ukegawa, Kensei Umemori, Junji Urakawa, Claude Vallee, Roberto Vega, Liliana Velasco, Silvia Verdu-Andres, Caterina Vernieri, Anna Vila, Ivan Vila Alvarez, Joost Vossebeld, Raghava Vsrms, Natasa Vukasinovic, Doreen Wackeroth, Moe Wakida, Liantao Wang, Masakazu Washio, Takashi Watanabe, Nigel Watson, Gordon Watts, Georg Weiglein, James D. Wells, Marc Wenskat, Susanne Westhoff, Glen White, Ciaran Williams, Stephane Willocq, Matthew Wing, Alasdair Winter, Marc Winter, Yongcheng Wu, Keping Xie, Tao Xu, Vyacheslav Yakovlev, Shuei Yamada, Akira Yamamoto, Hitoshi Yamamoto, Kei Yamamoto, Yasuchika Yamamoto, Masato Yamanaka, Satoru Yamashita, Masahiro Yamatani, Naoki Yamatsu, Shigehiro Yasui, Takuya Yoda, Ryo Yonamine, Keisuke Yoshihara, Masakazu Yoshioka, Tamaki Yoshioka, Fukuko Yuasa, Keita Yumino, Dirk Zerwas, Ya-Juan Zheng, Jia Zhou, Hua Xing Zhu, Mikhail Zobov, Fabian Zomer  

        2022年3月

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    The International Linear Collider (ILC) is on the table now as a new global
    energy-frontier accelerator laboratory taking data in the 2030s. The ILC
    addresses key questions for our current understanding of particle physics. It
    is based on a proven accelerator technology. Its experiments will challenge the
    Standard Model of particle physics and will provide a new window to look beyond
    it. This document brings the story of the ILC up to date, emphasizing its
    strong physics motivation, its readiness for construction, and the opportunity
    it presents to the US and the global particle physics community.

    arXiv

    その他リンク: http://arxiv.org/pdf/2203.07622v3

  2. Inflation in Supergravity with a Single Superfield

    Takahiro Terada  

        2015年8月

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    Supergravity is a well-motivated theory beyond the standard model of particle
    physics, and a suitable arena to study high-energy physics at the early
    universe including inflation, whose observational evidences are growing more
    and more. Inflation in supergravity, however, cannot be easily described
    because of restrictions from supersymmetry (SUSY). The scalar potential has an
    exponential factor and a large negative term whereas a flat and positive
    potential is needed to realize inflation. The standard method to obtain such an
    inflationary scalar potential requires an additional superfield to the one
    containing inflaton. In this thesis, we propose and develop an alternative
    method which does not require the additional superfield and thus reduces the
    necessary degrees of freedom by half. That is, we study inflation in
    supergravity with only a single chiral superfield which contains inflaton. We
    accomplish it by introducing a higher dimensional term in the inflaton Kahler
    potential, which plays an important dual role: fixing the value of the scalar
    superpartner of the inflaton resulting in effective single field models, and
    ensuring the positivity of the inflaton potential at the large field region.
    Our proposal is not just particular models but rather a new framework to
    realize various inflationary models in supergravity. In particular, large field
    inflation in supergravity using one superfield without tuning has become
    possible for the first time. In our generic models, SUSY breaking at the
    inflationary scale by inflaton is not completely restored after inflation, so
    null results for SUSY search at the LHC are predicted for the simplest cases.
    Remarkably, however, it is possible with tuning to embed arbitrary positive
    semidefinite scalar potentials into supergravity preserving SUSY at the vacuum.
    Our discovery opens up an entirely new branch of model building of inflation in
    supergravity.

    arXiv

    その他リンク: http://arxiv.org/pdf/1508.05335v1

  3. Toward Higgs inflation in the MSSM

    Takahiro Terada  

        2015年4月

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    Adopting a recently proposed single-superfield framework of supergravity
    inflation, we consider large field inflationary models in which MSSM Higgs-like
    fields play the role of the inflaton. In the simplest cases, the inflaton
    potential has a fractional power, which is different from that of the original
    Higgs inflation, and it can be tested by cosmological observations in near
    future. We find difficulties in identifying the inflaton with the MSSM Higgses
    and discuss possible candidates of the inflaton.

    arXiv

    その他リンク: http://arxiv.org/pdf/1504.06230v1

科研費 2

  1. 超重力理論におけるインフレーションの最前線

    研究課題/研究課題番号:17J00731  2017年4月 - 2020年3月

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    寺田 隆広

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    超重力理論や超弦理論では、スカラーポテンシャルの極小点の値が負である事がよくある。スカラー場がその周辺を通ると、宇宙は膨張から収縮に転じる。過去又は将来の宇宙で収縮が起きた場合でも、再び宇宙が膨張に転じ、指数関数的な急膨張であるインフレーションを引き起こせる事を示した。先行研究ではエネルギー条件を破るといった強い仮定がおかれていたが、正の空間曲率を仮定すれば通常の一般相対論の枠組み内で再膨張を引き起こせる事を示した。しかも、再膨張の為に導入する仕組みがインフレーションを可能にするというエコノミカルな仕組みになっており、観測結果とも整合的である。
    また、前年度の「初期曲率揺らぎから二次的に誘起される重力波」(二次重力波)の研究を発展・応用させる形で宇宙の再加熱前後における重力波生成について調べたところ、再加熱の時間スケールによって大幅に重力波の強さが変わる事が判明した。通常、 再加熱前に物質優勢期を形成している物質は固有の崩壊率で崩壊していくが、これに伴って曲率揺らぎも減少し、更には重力波が大きく減少する事が分かった。対照的に、仮に先行研究と同様に突然の再加熱遷移が起こった場合には、見落とされていた速い振動項の寄与によって非常に大きな重力波が生成されることを示した。この寄与は非常に大きく、再加熱温度や物質優勢期の長さによっては将来の重力波観測実験によって観測可能である。逆に言えば重力波が観測されなかったとしても再加熱温度の制限が可能であり、素粒子論的宇宙論において大きな意味を持つと共にインフレーション模型へのヒントにもなる。
    これらの他に、宇宙の再加熱前(物質優勢期)に出来た原始ブラックホールの初期密集度について研究を行い、再加熱後(放射優勢期)と比べると密集しづらい事が分かった。超重力理論でも長い物質優勢期が実現される場合があり、その様な模型と観測の比較に貢献する結果である。

  2. 超重力理論の拡張と宇宙論

    研究課題/研究課題番号:14J10619  2014年4月 - 2016年3月

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    寺田 隆広

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    本年度は主に、修正重力理論の一種であるスカラー・テンソル理論を超対称化した超重力理論を題材とした研究を行った。具体的には、前年度に発見した「単一の超場による超重力理論」を発展させ、最小超対称標準模型でのヒッグス・インフレーションに応用できるかを議論した。シンプルな仮定の下では成功しないことを結論付けたが、大統一理論のヒッグスなど、より一般の条件下での応用可能性がある。ヒッグス粒子は2012年に発見されており、この粒子に対応する場がインフレーションを引き起こしたかどうかは非常に興味深い疑問である。それを実現する模型の候補を制限したという意義がある。また、近年超重力理論でインフレーションを起こす方法として新たに見つかった「螺旋位相インフレーション」を、単一超場の枠組みでも実現できる事を示した。モノドロミーという特異性を許せば多様なインフレーション模型が実現可能である。一方、モノドロミー無しのシンプルな場合には、ナチュラル・インフレーションの超重力理論での最小の実現が可能である。これには、超重力理論でのインフレーション機構の新発見という意義の他に、ナチュラル・インフレーションをより基礎的な理論で記述できるようにしたという意義がある。研究実施計画に記述した国際研究会においてこれらの発見を発表した。この他に、年度内には雑誌掲載が決まらなかったがarXivに発表済みの研究として、インフレーション・アトラクター模型及び極インフレーションに関するものがある。極インフレーションの性質を一般化に調べ、多様なインフレーション模型が実現され得る事を発見した。超重力理論ではF項またはD項によってインフレーションが起きるが、殆ど議論されていなかった後者でのアトラクター機構を明確にした。これらはインフレーションの予言の普遍性及び多様性と、その背後にある理論の構造を明らかにしたという意義がある。