Brane gas-driven bulk expansion as a precursor stage to brane inflation

Abstract

We propose a new way of obtaining slow-roll inflation in the context of higher dimensional models motivated by string and M theory. In our model, all extra spatial dimensions are orbifolded. The initial conditions are taken to be a hot dense bulk brane gas which drives an initial phase of isotropic bulk expansion. This phase ends when a weak potential between the orbifold fixed planes begins to dominate. For a wide class of potentials, a period during which the bulk dimensions decrease sufficiently slowly to lead to slow-roll inflation of the three dimensions parallel to the orbifold fixed planes will result. Once the separation between the orbifold fixed planes becomes of the string scale, a repulsive potential due to string effects takes over and leads to a stabilization of the radion modes. The conversion of bulk branes into radiation during the phase of bulk contraction leads to reheating.

5 pages, no figures, same as published one

References in corpus (2)

• Why do we live in 3+1 dimensions?
• The Confining Heterotic Brane Gas: A Non-Inflationary Solution to the Entropy and Horizon Problems of Standard Cosmology

Cited by in corpus (9)

• On the new string theory inspired mechanism of generation of cosmological perturbations
• Stabilization of Compactification Volume In a Noncommutative Mini-Super-Phase-Space
• Lovelock inflation and the number of large dimensions
• Stabilization of the Extra Dimensions in Brane Gas Cosmology with Bulk Flux
• The Relic Problem of String Gas Cosmology
• Predictions of Dynamically Emerging Brane Inflation Models
• Colliding Branes and Formation of Spacetime Singularities
• String Gas Baryogenesis
• Wrapped brane gas as a candidate for Dark Matter