Singularity and exit problems in two-dimensional string cosmology

Abstract

A broad class of two-dimensional loop-corrected dilaton gravity models exhibit cosmological solutions that interpolate between the string perturbative vacuum and a background with asymptotically flat metric and linearly growing dilaton. The curvature singularities of the corresponding tree-level solutions are smoothed out, but no branch-change occurs. Thus, even in the presence of a non-perturbative potential, the system is not attracted by physically interesting fixed points with constant dilaton, and the exit problem of string cosmology persists.

11 pages, LATEX, one figure included using epsf. See also http://www.to.infn.it/teorici/gasperini/

References in corpus (3)

• Duality and Dilaton
• Graceful exit in quantum string cosmology
• Birth of the Universe as quantum scattering in string cosmology

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