Coupled inflation and brane gases

Tirthabir Biswas, Robert Brandenberger, Damien A. Easson, Anupam Mazumdar

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Abstract

We study an effective four-dimensional theory with an action with two scalar fields minimally coupled to gravity, and with a matter action which couples to the two scalar fields via an overall field-dependent coefficient in the action. Such a theory could arise from a dimensional reduction of supergravity coupled to a gas of branes winding the compactified dimensions. We show the existence of solutions corresponding to power-law inflation. The graceful exit from inflation can be obtained by postulating the decay of the branes, as would occur if the branes are unstable in the vacuum and stabilized at high densities by plasma effects. This construction provides an avenue for connecting string gas cosmology and the late-time universe.
Original languageEnglish
Article number083514
Number of pages9
JournalPhysical Review D
Volume71
Issue number8
DOIs
Publication statusPublished - Apr-2005
Externally publishedYes

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