Cosmological Solution from D-brane motion in NS5-Branes background

Details Cosmological Solution from D-brane motion in NS5-Branes background Cosmological Solution from D-brane motion in NS5-Branes background

2004-07-10

arxiv.org/abs/hep-th/0407079v4

Int.J.Mod.Phys. A20 (2005) 7633-7645

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, To appear in International Journal of Modern Physics A

Scientific paper

10.1142/S0217751X05022329

We study dynamics of a D3-brane propagating in the vicinity of k coincident NS5 branes. We show that when $g_s$ is small, there exists a regime in which dynamics of the D-brane is governed by Dirac-Born-Infeld action while higher order derivative in the expansion can not be neglected. This leads to a restriction on how fast scalar field may roll. We analyze the motion of a rolling scalar field in this regime, and extend the analysis to cosmological systems obtained by coupling this type of field theory to four dimensinal gravity. It also leads to some FRW cosmologies, some of which are related to those obtained with tachyon matter.

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