Theoretical foundation of higher order cosmological perturbation
| Project/Area Number |
26287044
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Research Collaborator |
Urakawa Yuko
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| Project Period (FY) |
2014-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 宇宙物理学 / インフレーション / 曲がった時空の場の理論 / 赤外発散 / 宇宙物理 / 場の理論 / 曲った時空の場の理論 |
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| Outline of Final Research Achievements |
The invariance under spacial scale transformation plays an important role in the conservation of curvature perturbation on super horizon scales.The effective action that received the loop correction is also proved to maintain this invariance. Besides the conservation of curvature perturbation, there are also universal properties such as consistency relations. Although these are often claimed to be related to the large gauge transformation, we show that locality conditions are further needed. It was also shown that the conditions for the observable physical quantities not to have infrared divergences are the same locality conditions. On the other hand, in collaboration with a graduate student, Mr. Junsei Tokuda, we formulated a systematic method to derive an effective equation of motion for long wavelength modes of a scalar field on a De Sitter background spacetime, and we showed that the dynamics governed by this equation can be interpreted as a classical stochastic process.
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| Academic Significance and Societal Importance of the Research Achievements |
インフレーション宇宙論は宇宙の初期条件に関わる諸問題の多くを解決することに成功した。しかし、インフレーション宇宙論の成功は、それ以前の宇宙を探索することを難しくしている。我々の研究は、その状況を打破する突破口を見出すべく、インフレーション宇宙論の基礎付けの脆弱な部分にメスを入れ、ほころびが生じないかを確かめる試みである。結果としては、これまでの理論予想の正しさを補強する、より強固な理論的枠組みを与えることに貢献したことになる。
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Report
(6 results)
Research Products
(66 results)
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[Presentation] 重力波で探る修正重力2015
Author(s)
田中貴浩
Organizer
第４回観測的宇宙論ワークショップ
Place of Presentation
基礎物理学研究所 京都大学(京都市)
Year and Date
2015-11-18
Related Report
Invited
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[Presentation] 重力波物理学2015
Author(s)
田中貴浩
Organizer
高宇連シンポジウム
Place of Presentation
広島大学（東広島市）
Year and Date
2015-03-10
Related Report
Invited
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[Presentation] 修正重力と重力波2014
Author(s)
田中貴浩
Organizer
天文天体若手夏の学校
Place of Presentation
戸倉上山田温泉(長野県千曲市)
Year and Date
2014-07-30
Related Report
Invited
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