Weak lensing predictions for modified gravities at nonlinear scales
Abstract
We present a set of predictions for weak lensing correlation functions in the context of modified gravity models, including a prescription for the impact of the nonlinear power spectrum regime in these models. We consider the Dvali, Gabadadze & Porrati and f(R) models, together with dark energy models with the same expansion history. We use the requirement that gravity is close to general relativity on small scales to estimate the nonlinear power for these models. We then calculate weak lensing statistics, showing their behaviour as a function of scale and redshift, and present predictions for measurement accuracy with future lensing surveys, taking into account cosmic variance and galaxy shape noise. We demonstrate the improved discriminatory power of weak lensing for testing modified gravities once the nonlinear power spectrum contribution has been included. We also examine the ability of future lensing surveys to constrain a parametrization of the nonlinear power spectrum, including sensitivity to the growth factor γ.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 March 2010
 DOI:
 10.1111/j.13652966.2009.16117.x
 arXiv:
 arXiv:0910.1480
 Bibcode:
 2010MNRAS.403..353B
 Keywords:

 gravitation;
 gravitational lensing;
 cosmology: theory;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 10 pages, 9 figures, 6 tables