A class of non-singular gravi-dilaton backgrounds

Details A class of non-singular gravi-dilaton backgrounds A class of non-singular gravi-dilaton backgrounds

1997-07-04

arxiv.org/abs/hep-th/9707053v1

Mod.Phys.Lett. A12 (1997) 1883-1889

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, LATEX, four figure included using EPSFIG. Essay written for the 1997 Awards of the Gravity Research Foundation, and s

Scientific paper

10.1142/S021773239700193X

We present a class of static, spherically symmetric, non-singular solutions of the tree-level string effective action, truncated to first order in $\alpha'$. In the string frame the solutions approach asymptotically (at $r\to 0$ and $r\to \infty$) two different anti-de Sitter configurations, thus interpolating between two maximally symmetric states of different constant curvature. The radial-dependent dilaton defines a string coupling which is everywhere finite, with a peak value that can be chosen arbitrarily small so as to neglect quantum-loop corrections. This example stresses the possible importance of finite-size $\alpha'$ corrections, typical of string theory, in avoiding space-time singularities.

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