Lensing at cosmological scales: a test of higher dimensional gravity

Abstract

Recent developments in gravitational lensing astronomy have paved the way to genuine mappings of the gravitational potential at cosmological scales. We stress that comparing these data with traditional large scale structure surveys will provide us with a test of gravity at such scales. These constraints could be of great importance in the framework of higher dimensional cosmological models.

Figures (3)

• Figure 1: Function $f_c(k\,r_s)$ as a function of $k\,r_s$ for $f(x)=1/(1+x)$.
• Figure 2: Growth factor $D_+(a)$ as a function of $a$ in an Einstein-de Sitter Universe for $k\,r_s=1$ (thick line) compared with the standard growth rate, $D_+\propto a$ (thin line).
• Figure 3: Expected matter (thick line) power and gravitational potential Laplacian (dashed line) power spectra as functions of $k$ compared to the standard cosmology case (thin line). We have assumed a CDM like scenario (with $\Gamma=0.25$) and $r_s=50\,h^{-1}\,$Mpc.