Galaxy-CMB Cross-Correlation as a Probe of Alternative Models of Gravity

Details Galaxy-CMB Cross-Correlation as a Probe of Alternative Models of Gravity Galaxy-CMB Cross-Correlation as a Probe of Alternative Models of Gravity

2007-06-12

arxiv.org/abs/0706.1775v2

Phys.Rev.D76:083518,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, revised version re-submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.76.083518

Bekenstein's alternative to general relativity, TeVeS, reduces to Modified Newtonian Dynamics (MOND) in the galactic limit. On cosmological scales, the (potential well <-> overdensity) relationship is quite different than in standard general relativity. Here we investigate the possibility of cross-correlating galaxies with the cosmic microwave background (CMB) to probe this relationship. At redshifts of order 2, the sign of the CMB-galaxy correlation differs in TeVeS from that in general relativity. We show that this effect is detectable and hence can serve as a powerful discriminator of these two models of gravity.

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