Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-12-18
Phys.Rev.D63:104013,2001
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, 8 figurea
Scientific paper
10.1103/PhysRevD.63.104013
First order rotational perturbations of the flat Friedmann-Robertson-Walker (FRW) metric are considered in the framework of four dimensional Neveu-Schwarz-Neveu-Schwarz (NS-NS) string cosmological models coupled with dilaton and axion fields. The decay rate of rotation depends mainly upon the dilaton field potential U. The equation for rotation imposes strong limitations upon the functional form of U, restricting the allowed potentials to two: the trivial case U=0 and a generalized exponential type potential. In these two models the metric rotation function can be obtained in an exact analytic form in both Einstein and string frames. In the potential-free case the decay of rotational perturbations is governed by an arbitrary function of time while in the presence of a potential the rotation tends rapidly to zero in both Einstein and string frames.
Chen Chiang-Mei
Harko Tiberiu
Mak Man-Kin
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