Kalb-Ramond axion production in anisotropic string cosmologies

Abstract

We compute the energy spectra for massless Kalb-Ramond axions in four-dimensional anisotropic string cosmological models. We show that, when integrated over directions, the four-dimensional anisotropic model leads to infra-red divergent spectra similar to the one found in the isotropic case.

Comments: 7 pages Latex, 3 postscript figs. included, submitted to PRD