  We study the conditions needed to have an early epoch of inflationary
expansion with a potential coming from IIB superstring theory with fluxes
involving two moduli fields. The phenomenology of this potential is different
from the usual hybrid inflation scenario and we analize the possibility that
the system of field equations undergo a period of inflation in three different
regimes with the dynamics modified by a Randall-Sundrum II term in the
Friedmann equation. We find that the system can produce inflation and due to
the modification of the dynamics, a period of accelerated contraction can
follow or preceed this inflationary stage depending on the sign of one of the
parameters of the potential. We discuss on the viability of this model in a
cosmological context.
