D-Brane Dynamics Near NS5-Branes
D. Kutasov

TL;DR
This paper investigates the real-time dynamics of a D-brane near NS5-branes using the Dirac-Born-Infeld action, revealing a pressureless fluid behavior and proposing decay into modes within the fivebrane throat, with exact solutions in certain regimes.
Contribution
It introduces a detailed analysis of D-brane decay near NS5-branes, linking tachyon condensation to radial modes and providing an exactly solvable conformal field theory description.
Findings
D-brane approaches pressureless fluid state near NS5-branes.
D-brane decays into modes in the fivebrane throat.
Exact worldsheet CFT describes radial motion deep inside the throat.
Abstract
We use the Dirac-Born-Infeld action to study the real time dynamics of a -brane propagating in the vicinity of -branes. This problem is closely related to tachyon condensation on an unstable D-brane, with the role of the tachyon played by the radial mode on the D-brane. As the D-brane approaches the fivebranes, its equation of state approaches that of a pressureless fluid. The pressure goes to zero at late times like ; is a function of the number of fivebranes and of the angular momentum of the D-brane. For unstable D-branes a similar equation of state is taken to signal the decay of the D-brane into closed string radiation. We propose that in our case the D-brane decays into modes propagating in the fivebrane throat, and show that this is consistent with spacetime expectations. We also argue that for radial motions of the D-brane deep inside the…
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Taxonomy
TopicsBlack Holes and Theoretical Physics · Solar and Space Plasma Dynamics · Astrophysics and Star Formation Studies
