| Project/Area Number |
24740160
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Nagoya University |
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Principal Investigator |
HIKAGE Chiaki 名古屋大学, 基礎理論研究センター, 特任助教 (00623555)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 宇宙論 / 宇宙大規模構造 / ダークエネルギー / 宇宙の構造形成 / 宇宙の加速膨張 / 修正重力 / 銀河形成 / 宇宙大構造 / 重力レンズ / 初期ゆらぎの非ガウス性 / ダークマター / ニュートリノ質量 / 修正重力理論 |
|---|
| Outline of Final Research Achievements |
The challenge in performing the precise cosmology analysis using galaxy redshift surveys is the uncertainty in the relationship between galaxies and dark matter distribution, in particular, the nonlinear redshift-space distortion due to the random motion of galaxies. I worked on the synergy of galaxy redshift survey and imaging survey and developed a novel method to make full use of the 3D matter information of the universe. I found that combining the gravitational lensing information with galaxy redshift surveys improve the accuracy of growth rate measurement nearly twice than the galaxy redshift survey only. I also succeed in developing another novel method to remove the uncertainty of nonlinear redshift-space distortion, i.e., Fingers-of-God effect, using high multipole components of galaxy power spectrum such as hexadecapole and tetra-hexadecapole, which has not been used in previous analysis. This work is beyond the original expectations.
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