  Loop quantum gravity introduces strong non-perturbative modifications to the
dynamical equations in the semi-classical regime, which are responsible for
various novel effects, including resolution of the classical singularity in a
Friedman universe. Here we investigate the modifications for the case of a
cyclic universe potential, assuming that we can apply the four-dimensional loop
quantum formalism within the effective four-dimensional theory of the cyclic
scenario. We find that loop quantum effects can dramatically alter the
near-collision dynamics of the cyclic scenario. In the kinetic-dominated
collapse era, the scalar field is effectively frozen by loop quantum friction,
so that the branes approach collision and bounce back without actual collision.

High Energy Physics - Theory;Astrophysics;General Relativity and Quantum Cosmology