Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.221102
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Funding
- BIS National E-infrastructure capital [ST/K00042X/1]
- STFC [ST/H008519/1]
- STFC DiRAC Operations Grant [ST/K003267/1]
- Durham University
- Science and Technology Facilities Council [ST/F001166/1]
- Polish National Science Center [DEC-2011/01/D/ST9/01960]
- ERC [GA 267291]
- FCT-Portugal [SFRH/BD/75791/2011]
- HPC Infrastructure for Grand Challenges of Science and Engineering Project
- European Regional Development Fund under the Innovative Economy Operational Programme
- STFC [ST/I001166/1, ST/F002300/1, ST/I00162X/1, ST/H008519/1, ST/K00042X/1, ST/F002289/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002300/1, ST/I001166/1, ST/H008519/1, ST/I00162X/1, ST/F002289/1, ST/K00042X/1] Funding Source: researchfish
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The velocity field of dark matter and galaxies reflects the continued action of gravity throughout cosmic history. We show that the low-order moments of the pairwise velocity distribution v(12) are a powerful diagnostic of the laws of gravity on cosmological scales. In particular, the projected line-of-sight galaxy pairwise velocity dispersion sigma(12)(r) is very sensitive to the presence of modified gravity. Using a set of high-resolution N-body simulations, we compute the pairwise velocity distribution and its projected line-of-sight dispersion for a class of modified gravity theories: the chameleon f(R) gravity and Galileon gravity (cubic and quartic). The velocities of dark matter halos with a wide range of masses would exhibit deviations from general relativity at the (5-10)sigma level. We examine strategies for detecting these deviations in galaxy redshift and peculiar velocity surveys. If detected, this signature would be a smoking gun for modified gravity.
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