  We consider a phenomenological modification of the Pre Big Bang scenario
using ideas from the resolution of curvature singularities in Loop Quantum
Cosmology. We show that non-perturbative Loop modifications to the dynamics,
arising from the underlying polymer representation, can resolve the graceful
exit problem. The curvature and the dilaton energy stay finite at all times, in
both the string and Einstein frames. In the string frame, the dilaton tends to
a constant value at late times after the bounce.

High Energy Physics - Theory;General Relativity and Quantum Cosmology