再加熱過程の精査を中心に初期宇宙の非平衡多体系のダイナミクスを明らかにする

• Project/Area Number: 15J07034
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: 向田 享平 東京大学, カブリ数物連携宇宙研究機構, 特別研究員(PD)
• Project Period (FY): 2015-04-24 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 素粒子論的宇宙論 / 真空崩壊 / 再加熱 / インフレーション / ブラックホール / Vacuum decay / Inflation / Preheating / Primordial Black Hole / Gravitational Wave / 初期宇宙論 / 熱場の理論 / 粒子生成 / 真空の安定性 / 宇宙論的相転移

Outline of Annual Research Achievements

本年度は，電弱真空の不安定性と、Primordial Black Hole (PBH)の研究に集中した。

i) 本年度も引き続き，我々の電弱真空が準安定だった場合における宇宙論との整合性について議論した．従来の研究では，inflation scaleが電弱真空が不安定になるscaleよりも大きい時の問題が主に議論されてきた．しかし，inflatonとHiggsの結合を一般には禁止することはできないため，inflation scaleが低くとも，この結合によって電弱真空の崩壊が誘発される可能性がある．これについて，inflation中のみならず，その後のpreheatingにおいても議論した．また，近年，蒸発している軽いBlack Holeがあると，BHが触媒となって電弱真空の崩壊が大幅に促進される可能性が指摘された．この議論について再考した．決定的な結論を出すことはできなかったが，先行研究に入っていない効果を明確にした．この効果によって，崩壊率は先行研究の見積もりと比較して大幅に抑制されるであろうことを指摘した．

ii) Primordial Black Holeをつくるためには，標準でない宇宙史が要求される．すなわち，原始揺らぎが大幅に大きくなければならない．しかし，そのような大きな原始揺らぎは観測によってすでに制限され始めている．将来的に，どういった場合にこの制限を逃れることができるのかをはっきりさせておくのは意味がある．curvatonのように，非ガウス性が大きくなる模型だと，PBH生成に影響を与える原始揺らぎのtailをenhanceすることができる．この場合，原始揺らぎのPBH生成と無関係な部分を抑制できるため，それに付随した，宇宙背景放射に対する影響や誘導される重力波の生成を多少抑制できる．この可能性を指摘し，明示的な模型を与えた．

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Double inflation as a single origin of primordial black holes for all dark matter and LIGO observations (2018)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Yanagida Tsutomu T.
  • Journal Title: Physical Review D Volume: 97 Issue: 4 Pages: 043514-043514
  • DOI: 10.1103/physrevd.97.043514
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Inflationary primordial black holes as all dark matter (2017)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Tada Yuichiro、Yanagida Tsutomu T.
  • Journal Title: Physical Review D Volume: 96 Issue: 4 Pages: 043504-043504
  • DOI: 10.1103/physrevd.96.043504
  • Peer Reviewed
• [Journal Article] Gravitino Problem in Minimal Supergravity Inflation (2017)
  • Author(s): F. Hasegawa, K. Mukaida, K. Nakayama, T. Terada and Y. Yamada
  • Journal Title: Physics Letter B Volume: 767 Pages: 392-392
  • DOI: 10.1016/j.physletb.2017.02.030
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] False vacuum decay catalyzed by black holes (2017)
  • Author(s): Kyohei Mukaida and Masaki Yamada
  • Journal Title: Phys. Rev. D Volume: 96 Issue: 10 Pages: 103514-103514
  • DOI: 10.1103/physrevd.96.103514
  • Peer Reviewed
• [Journal Article] Electroweak vacuum metastability and low-scale inflation (2017)
  • Author(s): Ema Yohei , Mukaida Kyohei , Nakayama Kazunori
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2017 Issue: 12 Pages: 030-030
  • DOI: 10.1088/1475-7516/2017/12/030
  • Peer Reviewed
• [Journal Article] O(10)M primordial black holes and string axion dark matter (2017)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Tada Yuichiro、Yanagida Tsutomu T.
  • Journal Title: Physical Review D Volume: 96 Issue: 12 Pages: 123527-123527
  • DOI: 10.1103/physrevd.96.123527
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Violent Preheating in Inflation with Nonminimal Coupling (2017)
  • Author(s): Y.Ema, R. Jinno, K. Mukaida and K. Nakayama
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 1702 Issue: 02 Pages: 045-045
  • DOI: 10.1088/1475-7516/2017/02/045
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] On Longevity of I-ball/Oscillon (2017)
  • Author(s): K.Mukaida, M.Takimoto and M.Yamada
  • Journal Title: JHEP Volume: 3 Issue: 3 Pages: 122-122
  • DOI: 10.1007/jhep03(2017)122
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Gravitational Particle Production in Oscillating Background and Its Cosmological Implication (2016)
  • Author(s): Y.Ema, R. Jinno, K. Mukaida and K. Nakayama
  • Journal Title: Physical Review D Volume: 94 Issue: 6 Pages: 063517-063517
  • DOI: 10.1103/physrevd.94.063517
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Simple cosmological solution to the Higgs field instability problem in chaotic inflation and the formation of primordial black holes (2016)
  • Author(s): M.Kawasaki, K.Mukaida and T.T.Yanagida
  • Journal Title: Phys. Rev. D Volume: 94 Issue: 6 Pages: 063509-063509
  • DOI: 10.1103/physrevd.94.063509
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Electroweak Vacuum Stabilized by Moduli during/after Inflation (2016)
  • Author(s): Yohei Ema, Kyohei Mukaida, Kazunori Nakayama
  • Journal Title: Physics Letters B Volume: 761 Pages: 419-423
  • DOI: 10.1016/j.physletb.2016.08.046
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Nonthermal Gravitino Production after Large Field Inflation (2016)
  • Author(s): Y. Ema, K. Mukaida, K. Nakayama and T. Terada
  • Journal Title: Journal of High Energy Physics Volume: 1611 Issue: 11 Pages: 184-184
  • DOI: 10.1007/jhep11(2016)184
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Thermalization Process after Inflation and Effective Potential of Scalar Field (2016)
  • Author(s): Kyohei Mukaida, Masaki Yamada
  • Journal Title: JCAP 1602 (2016) no.02, 003 Volume: 2 Issue: 02 Pages: 003-003
  • DOI: 10.1088/1475-7516/2016/02/003
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Particle Production after Inflation with Non-minimal Derivative Coupling to Gravity (2015)
  • Author(s): Y.Ema, R.Jinno, K.Mukaida, K.Nakayama
  • Journal Title: JCAP Volume: 1510 Issue: 10 Pages: 020-020
  • DOI: 10.1088/1475-7516/2015/10/020
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] On adiabatic invariant in generalized Galileon theories (2015)
  • Author(s): Y.Ema, R.Jinno, K.Mukaida, K.Nakayama
  • Journal Title: JCAP Volume: 1510 Issue: 10 Pages: 049-049
  • DOI: 10.1088/1475-7516/2015/10/049
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Inflationary PBHs for the LIGO gravitational wave events and Induced gravitational waves (2017)
  • Author(s): K.Mukaida
  • Organizer: HEP Matsue workshop 2017
  • Place of Presentation: Shimane Universit, Shimane
  • Year and Date: 2017-03-24
• [Presentation] PBHs from Inflation and their Implications (2017)
  • Author(s): 向田享平
  • Organizer: Focus week on Primordial Black Holes
  • Int'l Joint Research
• [Presentation] Probing Inflationary PBHs for the LIGO GW Events (2017)
  • Author(s): 向田享平
  • Organizer: PLANCK 2017
  • Int'l Joint Research
• [Presentation] Probing Inflationary PBHs for the LIGO GW Events (2017)
  • Author(s): 向田享平
  • Organizer: PASCOS 2017
  • Int'l Joint Research
• [Presentation] Probing Inflationary PBHs for the LIGO GW Events (2017)
  • Author(s): 向田享平
  • Organizer: DESY theory workshop
  • Int'l Joint Research
• [Presentation] Metastability, Chaotic Inflation, and Primordial Black Holes (2016)
  • Author(s): K.Mukaida
  • Organizer: Rethinking Quantum Field Theory
  • Place of Presentation: DESY, Hamburg, Germany
  • Year and Date: 2016-09-27
  • Int'l Joint Research
• [Presentation] Metastability, Chaotic Inflation, and Primordial Black Holes (2016)
  • Author(s): K.Mukaida
  • Organizer: Progress in Particle Physics 2016
  • Place of Presentation: YITP, Kyoto
  • Year and Date: 2016-09-05
• [Presentation] Reheating Process after Inflation (2016)
  • Author(s): K.Mukaida
  • Organizer: The Big Bang and the little bangs
  • Place of Presentation: CERN, Geneva, Switzerland,
  • Year and Date: 2016-08-15
  • Int'l Joint Research / Invited
• [Presentation] Metastable Electroweak Vacuum and Chaotic Inflation (2016)
  • Author(s): K.Mukaida
  • Organizer: PASCOS2016
  • Place of Presentation: ICISE, Quy Nhon, Vietnam
  • Year and Date: 2016-07-10
  • Int'l Joint Research
• [Presentation] Fate of Electroweak Vacuum during Preheating (2016)
  • Author(s): K.Mukaida
  • Organizer: The 1st KEK-KIAS-NCTS Joint Workshop on Particle Physics Phenomenology
  • Place of Presentation: NCTS, Hsinchu, Taiwan
  • Year and Date: 2016-05-26
  • Int'l Joint Research / Invited
• [Presentation] Fate of Electroweak Vacuum during Preheating (2016)
  • Author(s): Kyohei Mukaida
  • Organizer: Beyond the Standard Model in Okinawa 2016
  • Place of Presentation: OIST, 沖縄県恩納村
  • Year and Date: 2016-03-01
  • Int'l Joint Research
• [Presentation] Maximum Temperature of the Universe after Inflation (2016)
  • Author(s): Kyohei Mukaida
  • Organizer: KEKPH2016
  • Place of Presentation: KEK, 茨城県つくば市
  • Year and Date: 2016-02-11
  • Int'l Joint Research
• [Presentation] Thermalization after Inflation (2015)
  • Author(s): Kyohei Mukaida
  • Organizer: Particle Cosmology and beyond 2015
  • Place of Presentation: Kanazawa Art Hall, 石川県金沢市
  • Year and Date: 2015-11-18
  • Int'l Joint Research
• [Presentation] Relation between I- and Q-ball as non-relativistic condensates (2015)
  • Author(s): Kyohei Mukaida
  • Organizer: Progress of Particle Physics 2015
  • Place of Presentation: 基礎物理学研究所, 京都府京都市
  • Year and Date: 2015-09-17
• [Presentation] Thermalization after Inflation (2015)
  • Author(s): Kyohei Mukaida
  • Organizer: Cosmo-15
  • Place of Presentation: The University of Warsaw, Poland
  • Year and Date: 2015-09-07
  • Int'l Joint Research