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Paper detail

A weak lensing detection of a deviation from General Relativity on cosmic scales

We consider evidence for deviations from General Relativity (GR) in the growth of large scale structure, using two parameters, $γ$ and $η$, to quantify the modification. We consider the Integrated Sachs-Wolfe effect (ISW) in the WMAP Cosmic Microwave Background data, the cross-correlation between the ISW and galaxy distributions from 2MASS and SDSS surveys, and the weak lensing shear field from the Hubble Space Telescope&#39;s COSMOS survey along with measurements of the cosmic expansion history. We find current data, driven by the COSMOS weak lensing measurements, disfavors GR on cosmic scales, preferring $η<1$ at $1<z<2$ at the 98% significance level.

preprint2010arXivOpen access
Rachel Bean
astro-ph.CO
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