Brane gases in the early Universe

S. Alexander, R. Brandenberger, Damien Easson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Over the past decade it has become clear that fundamental strings are not the only fundamental degrees of freedom in string theory. D-branes are also part of the spectrum of fundamental states. In this paper we explore some possible effects of D-branes on early Universe string cosmology, starting with two key assumptions: firstly that the initial state of the Universe corresponded to a dense, hot gas in which all degrees of freedom were in thermal equilibrium, and secondly that the topology of the background space admits one-cycles. We argue by t duality that in this context the cosmological singularities are not present. We derive the equation of state of the brane gases and apply the results to suggest that, in an expanding background, the winding modes of fundamental strings will play the most important role at late times. In particular, we argue that the string winding modes will only allow four space-time dimensions to become large. The presence of brane winding modes with (Formula presented) may lead to a hierarchy in the sizes of the extra dimensions.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume62
Issue number10
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

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strings
universe
gases
degrees of freedom
high temperature gases
string theory
hierarchies
cosmology
equations of state
topology
cycles

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Brane gases in the early Universe. / Alexander, S.; Brandenberger, R.; Easson, Damien.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 62, No. 10, 01.01.2000.

Research output: Contribution to journalArticle

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