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Tubular solutions in NS5-brane, Dp-brane and macroscopic strings backgrounds

Wung-Hong Huang1

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We present our searches for the tubular bound states of a D2-brane with m D0-branes and n fundamental strings in the NS5-brane, Dp-brane or macroscopic strings background by solving the Dirac-Born-Infeld equation. The geometry of tubular configurations we considered are taken to be parallel to the background branes or macroscopic strings. The n fundamental strings therein may be the circular strings Fc or the straight strings Fs, which are along the cross section or the axis of the tube respectively. We show that the stable tubular bound states of (nFs, mD0, D2) which are prevented form collapse by the angular momentum, as original found in flat space, could be formed in the NS5-brane, D6-brane and macroscopic strings background. However, they becomes unstable in the D2-brane and D4-brane background. We also show that there are stable tubular bound states of (nFc, mD0, D2) and (mD0, D2), which are prevented form collapse by the gravitational forces in the backgrounds of D6-brane. We discuss the properties of these tubular solutions and see that only that in the macroscopic strings background is a supersymmetric BPS configuration.


Keywords

Tachyon Condensation

D-branes

 

E-print Number: hep-th/0502023

Cited: by |

Refers: to

PACS

11.25.Uv D branes

11.30.Pb Supersymmetry

Subjects

Particle physics and field theory

Dates

Issue 02 (February 2005)

Received 4 February 2005, accepted for publication 22 February 2005

Published 8 March 2005



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