String Variations on Kaluza-Klein Cosmology
arXiv:hep-th/9305138
Abstract
We study the cosmological solutions of the two-dimensional Brans-Dicke equations considering a gas of strings in $S^{1}\times \mbox{\bf R}$ as the source of the gravitational field. We also study the implications of the -duality invariance on the solutions. To this purpose we conjecture that, as it happens for massless fields in finite boxes, the free energy of a gas of massless string excitations is not given by the corresponding toroidal compactification.
20 pages, including 10 figures in a uuencoded file (using uufiles), LaTeX, FTUAM-93/14 (LaTeX errors corrected)