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Testing Gravity with the Stacked Phase Space around Galaxy Clusters

Lam, Tsz Yan and Nishimichi, Takahiro and Schmidt, Fabian and Takada, Masahiro (2012) Testing Gravity with the Stacked Phase Space around Galaxy Clusters. Physical Review Letters, 109 (5). Art. No. 051301. ISSN 0031-9007.

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In general relativity, the average velocity field of dark matter around galaxy clusters is uniquely determined by the mass profile. The latter can be measured through weak lensing. We propose a new method of measuring the velocity field (phase space density) by stacking redshifts of surrounding galaxies from a spectroscopic sample. In combination with lensing, this yields a direct test of gravity on scales of 1–30 Mpc. Using N-body simulations, we show that this method can improve upon current constraints on f(R) and Dvali-Gabadadze-Porrati model parameters by several orders of magnitude when applied to upcoming imaging and redshift surveys.

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Additional Information:© 2012 American Physical Society. Received 27 February 2012; revised manuscript received 22 May 2012; published 31 July 2012. T.Y. L., T. N., and M. T. are supported in part by Grant-in- Aid for Young Scientists (Grants No. 22740149 and No. 23340061) and by WPI Initiative, MEXT, Japan. Numerical calculations for the present work have been in part carried out under the Interdisciplinary Computational Science Program in the Center for Computational Sciences, University of Tsukuba and on Cray XT4 at the Center for Computational Astrophysics, CfCA, of the National Astronomical Observatory of Japan. F. S. is supported by the Gordon and Betty Moore Foundation at Caltech. M. T. is also supported by the FIRST program "Subaru Measurements of Images and Redshifts" (SuMIRe), CSTP, Japan.
Group:Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Grant-in-Aid for Young Scientists22740149
Grant-in-Aid for Young Scientists23340061
WPI Initiative (MEXT) (Japan)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
FIRST programme ‘Subaru Measurements of Images and Redshifts (SuMIRe) (Japan)UNSPECIFIED
Issue or Number:5
Classification Code:PACS: 98.80.Es, 04.50.-h, 04.80.Cc, 98.62.Sb
Record Number:CaltechAUTHORS:20120831-134910139
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33783
Deposited By: Tony Diaz
Deposited On:04 Sep 2012 17:10
Last Modified:03 Oct 2019 04:13

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