Towards a non-singular pre-big bang cosmology

Details Towards a non-singular pre-big bang cosmology Towards a non-singular pre-big bang cosmology

1996-11-06

arxiv.org/abs/hep-th/9611039v1

Nucl.Phys. B494 (1997) 315-330

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LATEX, five figures included using epsf. An updated collection of papers on the pre-big-bang scenario in string cosm

Scientific paper

10.1016/S0550-3213(97)00149-1

We discuss general features of the $\beta$-function equations for spatially flat, $(d+1)$-dimensional cosmological backgrounds at lowest order in the string-loop expansion, but to all orders in $\alpha'$. In the special case of constant curvature and a linear dilaton these equations reduce to $(d+1)$ algebraic equations in $(d+1)$ unknowns, whose solutions can act as late-time regularizing attractors for the singular lowest-order pre-big bang solutions. We illustrate the phenomenon in a first order example, thus providing an explicit realization of the previously conjectured transition from the dilaton to the string phase in the weak coupling regime of string cosmology. The complementary role of $\alpha'$ corrections and string loops for completing the transition to the standard cosmological scenario is also briefly discussed.

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