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Duality in string cosmology

  • Ram Brustein
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 525)

Abstract

Scale factor duality, a truncated form of time dependent T-duality, is a symmetry of string effective action in cosmological backgrounds interchanging small and large scale factors. The symmetry suggests a cosmological scenario (“pre-big-bang”) in which two duality related branches, an inflationary branch and a decelerated The use of scale factor duality in the analysis of the higher derivative corrections to the effective action, and consequences for the nature of exit transition, between the inflationary and decelerated branches, are outlined. A new duality symmetry is obeyed by the lowest order equations for inhomogeneity perturbations which always exist on top of the homogeneous and isotropic background. In some cases it corresponds to a time dependent version of S-duality, interchanging weak and strong coupling and electric and magnetic degrees of freedom, and in most cases it corresponds to a time dependent mixture of both S-, and T-duality. The energy spectra obtained by using the new symmetry reproduce known results of produced particle spectra, and can provide a useful lower bound on particle production when our knowledge of the detailed dynamical history of the background is approximate or incomplete.

Keywords

String Scale High Derivative Correction Hamiltonian Density Duality Symmetry Cosmological Scenario 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • Ram Brustein
    • 1
  1. 1.Department of PhysicsBen-Gurion UniversityBeer-ShevaIsrael

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