2013 Fiscal Year Final Research Report
Testing gravity theory on the cosmological scales using the next generation dark energy surveys
| Project/Area Number |
21540270
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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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 | Hiroshima University |
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Principal Investigator |
YAMAMOTO Kazuhiro 広島大学, 理学(系)研究科(研究院), 准教授 (50284154)
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| Project Period (FY) |
2009-04-01 – 2014-03-31
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| Keywords | 修正重力 / 大規模構造 / 重力レンズ / 銀河団 / ダークエネルギー / パワースペクトル解析 / 銀河サーベイ / 観測的宇宙論 |
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| Research Abstract |
We studied the problem of whether the modified gravity models, which are proposed to explain the cosmic accelerated expansion, can be really viable solutions or not. To this end, we studied the aspects from the view points of the cosmological consistency, and obtained the following results. (1) We established the method of testing the gravity theory on the cosmological scales using the multipole power spectrum in the galaxy distribution, and demonstrated the usefulness of the method with the SDSS galaxy samples. (2) We clarified the characteristic behaviors and properties of the cosmological models of an f(R) model, the galileon models and its extended versions. We obtained the useful constraints on each model. (3) We found the possibility that a characteristic feature of modified gravity models may appear in the outskirt region of galaxy clusters, and developed a new method for testing gravity by combining X-ray, lensing, and Sunyaev-Zeldovich effect observations of a cluster.
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