  Quintessential inflation is studied using a string modulus as the inflaton -
quintessence field. It is assumed that the modulus crosses an enhanced symmetry
point (ESP) in field space. Particle production at the ESP temporarily traps
the modulus resulting in a period of inflation. After reheating, the modulus
freezes due to cosmological friction at a large value, such that its scalar
potential is dominated by contributions due to fluxes in the extra dimensions.
The modulus remains frozen until the present, when it can become quintessence.
