Brane Gas Cosmology and Loitering
arXiv:hep-th/0111055
Abstract
In Brane Gas Cosmology (BGC) the initial state of the universe is taken to be small, dense and hot, with all fundamental degrees of freedom near thermal equilibrium. This starting point is in close analogy with the Standard Big Bang (SBB) model. In the simplest example, the topology of the universe is assumed to be toroidal in all nine spatial dimensions and is filled with a gas of -branes. The dynamics of winding modes allow, at most, three spatial dimensions to become large, providing a possible explanation to the origin of our macroscopic (3+1)-dimensional universe. Specific solutions are found within the model that exhibit loitering, i.e. the universe experiences a short phase of slow contraction during which the Hubble radius grows larger than the physical extent of the universe. This phase is studied by combining the dilaton gravity background equations of motion with equations that determine the annihilation of string winding modes into string loops. Loitering provides a solution to the brane problem (generalised domain wall problem) in BGC and the horizon problem of the SBB scenario. In BGC the initial singularity problem of the SBB scenario is solved, without relying on an inflationary phase due to the presence of the T-duality symmetry in the theory.
Invited talk at COSMO-01 Workshop, Rovaniemi, Finland, August 30 - September 4, 2001; 25 pages, LaTeX, 6 eps figures
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Cited by in corpus (8)
- Stabilization of Extra Dimensions at Tree Level
- Fractional Brane State in the Early Universe
- Effective Field Theory Approach to String Gas Cosmology
- Linear Perturbations in Brane Gas Cosmology
- On Winding Branes and Cosmological Evolution of Extra Dimensions in String Theory
- UV Perturbations in Brane Gas Cosmology
- Entropy of Anisotropic Universe and Fractional Branes
- Form-field bremsstrahlung under collision of p-branes