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Journal Article

A class of non-singular gravi-dilaton backgrounds


Buonanno,  A.
Theory Division, CERN;
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa;
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Buonanno, A., Gasperini, M., & Ungarelli, C. (1997). A class of non-singular gravi-dilaton backgrounds. Modern Physics Letters A, 25(12): CERN-TH/97-41, pp. 1883-1889. doi:10.1142/S021773239700193X.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-BDEB-2
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.