Precise modeling of redshift-space distortions in galaxy surveys and cosmological test on gravity theories

2015 Fiscal Year Final Research Report

• Project/Area Number: 26887012
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Okumura Teppei 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (70402427)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: 宇宙大規模構造 / 暗黒エネルギー / 重力理論の検証 / 銀河サーベイ / 赤方偏移変形

Outline of Final Research Achievements

I have performed theoretical and observational studies using galaxy surveys to understand properties of the cosmic acceleration. On theoretical side, considering the fact that future large surveys can determine the dark energy properties with percent accuracy, I have developed a theoretical model which accurately predicts the galaxy power spectrum by combining the cosmological perturbation theory and the empirical halo model. On the observational side, I have led the cosmological analysis of the international project called the Subaru FastSound Galaxy Survey, and I performed a test on gravity theory at the distant universe 10 billion years away. For the first time in the world, I have found that the gravity law is consistent with Einsteins's general relativity at such distant universe.

Free Research Field

観測的宇宙論