paper

Testing Gravity Against Early Time Integrated Sachs-Wolfe Effect

arXiv:astro-ph/0511218 · doi:10.1103/PhysRevD.73.123504

Abstract

A generic prediction of general relativity is that the cosmological linear density growth factor is scale independent. But in general, modified gravities do not preserve this signature. A scale dependent can cause time variation in gravitational potential at high redshifts and provides a new cosmological test of gravity, through early time integrated Sachs-Wolfe (ISW) effect-large scale structure (LSS) cross correlation. We demonstrate the power of this test for a class of gravity, with the form . Such gravity, even with degenerate expansion history to CDM, can produce detectable ISW effect at $z\ga 3$ and $l\ga 20$. Null-detection of such effect would constrain to be at confidence level. On the other hand, robust detection of ISW-LSS cross correlation at high will severely challenge general relativity.

5 pages, 2 figures. Accepted to PRD. v2: Revised to address to more general audience. v3: added discussions

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