Two Windows on Acceleration and Gravitation: Dark Energy or New Gravity?
L. Knox, Y. -S. Song, J. A. Tyson
Abstract
Small distortions in the observed shapes of distant galaxies, a cosmic shear due to gravitational lensing, can be used to simultaneously determine the distance-redshift relation, r(z), and the density contrast growth factor, g(z). Both of these functions are sensitive probes of the acceleration. Their simultaneous determination allows for a consistency test and provides sensitivity to physics beyond the standard dark energy paradigm.
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