Published July 31, 2012
| Published
Journal Article
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Testing Gravity with the Stacked Phase Space around Galaxy Clusters
Chicago
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Abstract
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.
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.Attached Files
Published - Lam2012p19323Phys_Rev_Lett.pdf
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Lam2012p19323Phys_Rev_Lett.pdf
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Additional details
- Eprint ID
- 33783
- Resolver ID
- CaltechAUTHORS:20120831-134910139
- Grant-in-Aid for Young Scientists
- 22740149
- Grant-in-Aid for Young Scientists
- 23340061
- WPI Initiative (MEXT) (Japan)
- Gordon and Betty Moore Foundation
- FIRST programme 'Subaru Measurements of Images and Redshifts (SuMIRe) (Japan)
- Created
-
2012-09-04Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Moore Center for Theoretical Cosmology and Physics