COSMOS weak-lensing constraints on modified gravity
Ismael Tereno, Elisabetta Semboloni, Tim Schrabback
TL;DR
This paper uses COSMOS weak lensing data to test for deviations from General Relativity in explaining cosmic acceleration, finding no significant evidence for modified gravity.
Contribution
It introduces a model-independent parametrization of cosmic shear and growth to constrain modified gravity using weak lensing data.
Findings
No significant deviation from General Relativity detected.
Constraints on modified gravity parameters are consistent with GR.
Weak lensing data supports standard cosmological model.
Abstract
The observed acceleration of the universe, explained through dark energy, could alternatively be explained through a modification of gravity that would also induce modifications in the evolution of cosmological perturbations. We use new weak lensing data from the COSMOS survey to test for deviations from General Relativity. The departure from GR is parametrized in a model-independent way that consistently parametrizes the two-point cosmic shear amplitude and growth. Using CMB priors, we perform a likelihood analysis. We find constraints on the amplitude of the signal that do not indicate a deviation from General Relativity.
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