Brane gases in the early Universe

S. Alexander, R. Brandenberger, Damien Easson

Research output: Contribution to journalArticle

185 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 p>1 may lead to a hierarchy in the sizes of the extra dimensions.

Original languageEnglish (US)
Article number103509
Pages (from-to)1-7
Number of pages7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume62
Issue number10
StatePublished - Nov 15 2000
Externally publishedYes

Fingerprint

Early Universe
Branes
strings
universe
Strings
D-branes
gases
degrees of freedom
Degree of freedom
Extra Dimensions
Thermal Equilibrium
high temperature gases
String Theory
Cosmology
Equation of State
string theory
hierarchies
cosmology
Duality
equations of state

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical 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, 103509, 15.11.2000, p. 1-7.

Research output: Contribution to journalArticle

Alexander, S, Brandenberger, R & Easson, D 2000, 'Brane gases in the early Universe', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 62, no. 10, 103509, pp. 1-7.
Alexander, S. ; Brandenberger, R. ; Easson, Damien. / Brane gases in the early Universe. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2000 ; Vol. 62, No. 10. pp. 1-7.
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