  In this paper, we study the effects of super-light brane world perturbative
modes on structure formation in our universe. As these modes modify the large
distance behavior of Newtonian potential, they effect the clustering of a
system of galaxies. So, we explicitly calculate the clustering of galaxies
interacting through such a modified Newtonian potential. We use a suitable
approximation for analyzing this system of galaxies, and discuss the validity
of such approximations. We observe that such corrections also modify the virial
theorem for such a system of galaxies.
