Testing gravity on Large Scales

Abstract

Abstract. We show how it is possible to test general relativity and different models of gravity via Redshift-Space Distortions using forthcoming cosmological galaxy surveys. However, the theoretical models currently used to interpret the data often rely on simplifications that make them not accurate enough for precise measurements. We will discuss improvements to the theoretical modeling at very large scales, including wide-angle and general relativistic corrections; we then show that for wide and deep surveys those corrections need to be taken into account if we want to measure the growth of structures at a few percent level, and so perform tests on gravity, without introducing systematic errors. Finally, we report the results of some recent cosmological model tests carried out using those precise models.

Curvature constraints from large scale structure

“…[47][48][49][50][51][52][53][54]. Recently the effects of relativistic corrections on 2-point [10,[55][56][57][58][59][60][61] and higher order statistics [62][63][64] have been studied, and methods to isolate them have been proposed [65][66][67][68][69]. It is now timely to investigate the potential of large-scale effects to measurements of the curvature parameter.…”