String cosmology of the D-brane universe

doi:10.1103/PhysRevD.74.126001

Paper

String cosmology of the D-brane universe

Published Mar 22, 2006 · Inyong Cho, E. Chun, H. Kim

Physical Review D

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Abstract

We analyze homogeneous anisotropic cosmology driven by the dilaton and the self-interacting ''massive'' antisymmetric tensor field which are indispensable bosonic degrees with the graviton in the NS-NS sector of string theories with D-branes. We found the attractor solutions for this system, which show the overall features of general solutions, and confirmed it through numerical analysis. The dilaton possesses the potential due to the presence of the D-brane and the curvature of extra dimensions. In the presence of the nonvanishing antisymmetric tensor field, the homogeneous universe expands anisotropically while the D-brane term dominates. The isotropy is recovered as the dilaton rolls down and the curvature term dominates. With the stabilizing potential for the dilaton, the isotropy can also be recovered.

Study Snapshot

The dilaton and antisymmetric tensor field in string theories with D-branes can drive anisotropic universe expansion, with isotropy recovered when the dilaton rolls down and the curvature term dominates.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

String cosmology of the D-brane universe

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