Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.051301
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Funding
- WPI Initiative, MEXT, Japan
- Gordon and Betty Moore Foundation at Caltech
- FIRST program Subaru Measurements of Images and Redshifts (SuMIRe), CSTP, Japan
- [22740149]
- [23340061]
- Grants-in-Aid for Scientific Research [23340061, 10J00181, 18072005] Funding Source: KAKEN
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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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