TL;DR
This paper classifies Bianchi-type string cosmological models with diagonal metrics and zero cosmological constant, providing insights into spatial anisotropy's role in early universe dynamics.
Contribution
It offers a comprehensive classification of Bianchi-type backgrounds in string cosmology, focusing on previously unexamined diagonal metric cases with zero cosmological constant.
Findings
Classified all Bianchi-type backgrounds with diagonal metrics.
Provided prototypes for studying spatial anisotropy in early universe.
Enhanced understanding of anisotropic string cosmological solutions.
Abstract
Bianchi-type string cosmology involves generalizations of the FRW backgrounds with three transitive spacelike Killing symmetries, but without any a priori assumption of isotropy in the 3D sections of homogeneity. With emphasis on those cases with diagonal metrics and vanishing cosmological constant which which have not been previously examined in the literature, the present findings allow an overview and the classification of all Bianchi-type backgrounds. These string solutions (at least to lowest order in alpha prime) offer prototypes for the study of spatial anisotropy and its impact on the dynamics of the early universe.
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