D-brane dynamics in RR deformation of NS5-branes background and tachyon cosmology

Ghodsi, Ahmad; Mosaffa, Amir E.

doi:10.1016/j.nuclphysb.2005.02.025

Cited by 38 publications

(23 citation statements)

References 52 publications

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“…The similarity between the DBI effective action for the tachyon and that of a probe D-brane near NS5-Branes, for homogeneous solutions, was recently studied by Kutasov [4]. Some other recent works on similar topics (again for the homogeneous case) include [5,6,7,8,9]. Previous works [10,11] on the generic inhomogeneous solution in the theory (1) were focused on the open string theory tachyon effective action, with runaway potential of exponential asymptotic form: V (T ) ≃ exp(−T ).…”

Section: Introductionmentioning

confidence: 91%

Folding branes

2005

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We study classical dynamics of a probe Dp-brane moving in a background sourced by a stack of Dp-branes. In this context the physics is similar to that of the effective action for open-string tachyon condensation, but with a power-law runaway potential. We show that small inhomogeneous ripples of the probe brane embedding grow with time, leading to folding of the brane as it moves. We give a full nonlinear analytical treatment of inhomogeneous brane dynamics, suitable for the Dirac-Born-Infeld + Wess-Zumino theory with arbitrary runaway potential, in the case where the source branes are BPS. In the near-horizon geometry, the inhomogeneous brane motion has a dual description in terms of free streaming of massive relativistic test particles originating from the initial hypersurface of the probe brane. We discuss limitations of the effective action description around loci of self-crossing of the probe brane (caustics). We also discuss the effect of brane folding in application to the theory of cosmological fluctuations in string theory inflation.

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Section: Introductionmentioning

confidence: 91%

Folding branes

2005

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“…In fact, if we place a BPS Dp-brane at finite distance from a stack of NS5-branes it will experience an attractive force and will start moving towards to fivebranes. It was shown in [1] that the real time dynamics of a D-brane near a stack of NS5-branes exhibits a close connection 1 For other works considering related problems, see [2,3,4,5,6,7,8]. 2 The directions along worldvolume of the fivebranes will be denoted by x µ , µ = 0, 1, 2, .…”

Section: Introductionmentioning

confidence: 99%

Non-BPS D-brane Near NS5-branes

Klusoň

2004

J. High Energy Phys.

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We use tachyon field theory effective action to study the dynamics of a non-BPS Dp-brane propagating in the vicinity of k NS5-branes. For the time dependent tachyon condensation we will concentrate on the case of the large tachyon and the case when a non-BPS D-brane is close to NS5-branes. For spatial dependent tachyon condensation we will argue that the problem reduces to the study of the motion of an array of D(p-1)-branes and D(p-1)-antibranes in the vicinity of k NS5-branes.

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“…More recently a close relationship between the geometric tachyon and the universal open string tachyon has been extensively discussed by Sen [19] (see also [20], [21]). The geometric tachyon has also played an interesting role in the inflationary models in cosmology [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Proper acceleration, the geometric tachyon and the dynamics of a fundamental string near D p branes

Das¹,

Panda²,

Roy³

2009

Class. Quantum Grav.

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We present a detailed analysis of our recent observation that the origin of the geometric tachyon, which arises when a Dp-brane propagates in the vicinity of a stack of coincident NS5-branes, is due to the proper acceleration generated by the background dilaton field. We show that when a fundamental string (F-string), described by the Nambu-Goto action, is moving in the background of a stack of coincident Dp-branes, the geometric tachyon mode can also appear since the overall conformal mode of the induced metric for the string can act as a source for proper acceleration. We also studied the detailed dynamics of the F-string as well as the instability by mapping the Nambu-Goto action of the F-string to the tachyon effective action of the non-BPS D-string. We qualitatively argue that the condensation of the geometric tachyon is responsible for the (F,Dp) bound state formation.

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D-brane dynamics in RR deformation of NS5-branes background and tachyon cosmology

Cited by 38 publications

References 52 publications

Folding branes

Folding branes

Non-BPS D-brane Near NS5-branes

Proper acceleration, the geometric tachyon and the dynamics of a fundamental string near D p branes

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