Dbrane Near NS5-branes: with Electromagnetic Field

TL;DR

This paper investigates how a constant electromagnetic field influences the dynamics of Dp-branes near NS5-branes, revealing effects on motion, closed string emission, and energy transfer, with implications for string theory and brane interactions.

Contribution

It introduces a detailed analysis of Dp-brane behavior under electromagnetic fields near NS5-branes using effective Dirac-Born-Infeld action, highlighting new effects on motion and emission.

Findings

Electromagnetic field alters Dp-brane radial motion.

Closed string emission energy remains finite with electric field.

Winding strings cause divergent energy emission.

Abstract

We study the Dp-brane dynamics near NS5-branes with constant electromagnetic field. In the framework of effective Dirac-Born-Infeld action, we investigate the effect of the electromagnetic field on the Dp-brane dynamics. The radial motion of the Dp-brane on the transverse directions of NS5-branes can be mapped to a rolling tachyon in a constant NS $B_{\mu\nu}$ background. In the near throat region, the classical motion can be identified with the rescaled hairpin. After constructing the boundary state of the rescaled hairpin, we discuss the closed string emission of the Dp-brane and find that the energy of the closed string emission is always finite in the presence of electric field. Taking winding strings into account, the emitted energy is divergent, indicating that the emitted winding strings carry away most of energy.