Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-09-14
Phys.Rev. D53 (1996) 4247-4256
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 18 pages, plus 5 pages of postscript figures
Scientific paper
10.1103/PhysRevD.53.4247
In this paper we examine the classical evolution of a cosmological model derived from the low-energy tree-level 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 becomes large and loop corrections will become important.
Easther Richard
Maeda Kei--ichi
Wands David
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