Treelevel string cosmology
Abstract
In this paper we examine the classical evolution of a cosmological model derived from the lowenergy treelevel limit of a generic string theory. The action contains the metric, dilaton, central charge and an antisymmetric tensor field. We show that with a homogeneous and isotropic metric, allowing spatial curvature, there is a formal equivalence between this system and a scalar field minimally coupled to Einstein gravity in a spatially flat metric. We refer to this system as the shifted frame and using it we describe the full range of cosmological evolution that this model can exhibit. We show that generic solutions begin (or end) with a singularity. As the system approaches a singularity the dilaton becomes large and loop corrections will become important.
 Publication:

Physical Review D
 Pub Date:
 April 1996
 DOI:
 10.1103/PhysRevD.53.4247
 arXiv:
 arXiv:hepth/9509074
 Bibcode:
 1996PhRvD..53.4247E
 Keywords:

 98.80.Cq;
 04.50.+h;
 11.25.w;
 Particletheory and fieldtheory models of the early Universe;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity;
 Strings and branes;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology
 EPrint:
 Latex, 18 pages, plus 5 pages of postscript figures