Classical Inhomogeneities in String Cosmology

Buonanno, A.; Meissner, K. A.; Ungarelli, C.; Veneziano, G.

doi:10.1103/PhysRevD.57.2543

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Classical Inhomogeneities in String Cosmology

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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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hep-th_9706221.pdf
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PhysRevD.57_04.pdf
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Citation

Buonanno, A., Meissner, K. A., Ungarelli, C., & Veneziano, G. (1998). Classical Inhomogeneities in String Cosmology. Physical Review D, 57, 2543-2556. doi:10.1103/PhysRevD.57.2543.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-BDE1-5

Abstract

We generalize previous work on inhomogeneous pre-big bang cosmology by including the effect of non-trivial moduli and antisymmetric-tensor/axion fields. The general quasi-homogeneous asymptotic solution---as one approaches the big bang singularity from perturbative initial data---is given and its range of validity is discussed, allowing us to give a general quantitative estimate of the amount of inflation obtained during the perturbative pre-big bang era. The question of determining early-time ``attractors'' for generic pre-big bang cosmologies is also addressed, and a motivated conjecture is advanced. We also discuss S-duality-related features of the solutions, and speculate on the way an asymptotic T-duality symmetry may act on moduli space as one approaches the big bang.