Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1999-05-18
Mod.Phys.Lett. A14 (1999) 1059-1066
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
11 pages, Latex, four figures included using epsfig. Essay written for the 1999 Awards of the Gravity Research Foundation (Wel
Scientific paper
10.1142/S0217732399001127
String theory can (in principle) describe gravity at all curvature scales, and can be applied to cosmology to look back in time beyond the Planck epoch. The duality symmetries of string theory suggest a cosmological picture in which the imprint of a primordial, pre-big bang phase could still be accessible to present observations. The predictive power of such a scenario relies, however, on our ability to connect in a smooth way the pre-big bang to the present cosmological regime. Classical radiation back reaction seems to play a key role to this purpose, by isotropizing and turning into a final expansion any state of anisotropic contraction possibly emerging from the pre-big bang at the string scale.
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