Synergy analysis of galaxy imaging and redshift surveys

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740160
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: HIKAGE Chiaki 名古屋大学, 基礎理論研究センター, 特任助教 (00623555)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 宇宙論 / 宇宙大規模構造 / ダークエネルギー

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.

Free Research Field

宇宙論