Rotational perturbations in Neveu-Schwarz - Neveu-Schwarz string cosmology

C. M. Chen, T. Harko, M. K. Mak

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)


First order rotational perturbations of the flat Friedmann-Robertson-Walker metric are considered in the framework of four dimensional Neveu-Schwarz - Neveu-Schwarz string cosmological models coupled with dilaton and axion fields. For the H field we use the solitonic ansatz, assuming that it is a function of time only. 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.

頁(從 - 到)1040131-10401310
期刊Physical Review D - Particles, Fields, Gravitation and Cosmology
出版狀態已出版 - 2001


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