D-brane Dynamics in RR Deformation of NS5-branes Background and Tachyon Cosmology

TL;DR

This paper investigates D-brane dynamics in RR-deformed NS5-brane backgrounds, revealing parallels with rolling tachyon behavior and constructing cosmological models that exhibit both open and closed universes with potential for slow roll inflation.

Contribution

It introduces a novel analysis of D-brane behavior in RR-deformed backgrounds and develops tachyon-inspired cosmological models with diverse universe geometries.

Findings

Pressure decreases exponentially at late times, similar to rolling tachyon.

Cosmological models can produce both open and closed universes.

Conditions for slow roll inflation are identified.

Abstract

We study D-brane dynamics in the gravity dual background of ODp theories using the effective action on the worldvolume of the brane. We explore the similarities of the system with the rolling tachyon, including the exponential decrease of pressure at late times. We also consider the case where the worldvolume theory on a D3-brane is coupled to gravity and construct a cosmological model. By considering the time reversal symmetric solutions, we find that we can have both closed and open universes depending on the initial value of the radial mode on the brane. We compare the models with tachyon driven cosmologies and find limits where slow roll inflation is realized.