  With the developments of large galaxy surveys or cosmic shear surveys it is
now possible to map the dark matter distribution at truly cosmological scales.
Detailed examinations of the statistical properties of the dark matter
distribution reveal the detail of the large-scale structure growth of the
Universe. In particular it is shown here that the behavior of the density field
bi-spectrum is sensitive to departure from normal gravity in a way which
depends only weakly on the background evolution. The cosmic shear bispectrum
appears to be particularly sensitive to changes in the Poisson equation: we
show that the current cosmic shear data can already be used to infer
constraints on the scale of a possible higher-dimensional gravity, above 2
h^{-1}Mpc.
