DENSITY PERTURBATIONS IN KALUZA-KLEIN THEORIES DURING A DE SITTER PHASE

Authors
FABRIS JC SAKELLARIADOU M
Citation
Jc. Fabris et M. Sakellariadou, DENSITY PERTURBATIONS IN KALUZA-KLEIN THEORIES DURING A DE SITTER PHASE, Classical and quantum gravity, 14(3), 1997, pp. 725-733
Citations number
17
Categorie Soggetti
Physics
Journal title
Classical and quantum gravity → ACNP
ISSN journal
02649381
Volume
14
Issue
3
Year of publication
1997
Pages
725 - 733
Database
ISI
SICI code
0264-9381(1997)14:3<725:DPIKTD>2.0.ZU;2-#
Abstract
In the context of Kaluza-Klein theories, we consider a model in which the universe is filled with a perfect fluid described by a barotropic equation of state. An analysis of density perturbations employing the synchronous gauge shows that there are cases where these perturbations have an exponential growth during a de Sitter phase evolution in the external space.