  In this talk I will discuss the role of finite temperature quantum
corrections in string cosmology and show that they can lead to a stabilization
mechanism for the volume moduli. I will show that from the higher dimensional
perspective this results from the effect of states of enhanced symmetry on the
one-loop free energy. These states lead not only to stabilization, but also
suggest an alternative model for cold dark matter. At late times, when the low
energy effective field theory gives the appropriate description of the
dynamics, the moduli will begin to slow-roll and stabilization will generically
fail. However, stabilization can be recovered by considering cosmological
particle production near the points of enhanced symmetry leading to the process
known as moduli trapping.
