Low Energy Effective Action for Horava-Witten Cosmology

Abstract

As a supersymmetric extension of the Randall-Sundrum model, we consider a 5-dimensional Horava-Witten type theory, and derive its low energy effective action. The model we consider is a two-brane system with a bulk scalar field satisfying the BPS condition. We solve the bulk equations of motion using a gradient expansion method, and substitute the solution into the original action to get the 4-dimensional effective action. The resultant effective theory can be casted into the form of Einstein gravity coupled with two scalar fields, one arising from the radion, the degree of freedom of the inter-brane distance, and the other from the bulk scalar field. We also clarify the relation between our analysis and the moduli approximation.

11 pages

References in corpus (4)

• Low Energy Branes, Effective Theory and Cosmology
• Moduli-Space Approximation for BPS Brane-Worlds
• On the Validity of a Factorizable Metric Ansatz in String Cosmology
• Gauges in the Bulk II: Models with Bulk Scalars

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• The dynamics of scalar-tensor cosmology from RS two-brane model
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• Moduli instability in warped compactification - 4D effective theory approach
• On the four-dimensional effective theories in brane-worlds