On minisuperspace models of S-branes

Fredenhagen, Stefan; Schomerus, Volker

doi:10.1088/1126-6708/2003/12/003

Cited by 48 publications

(93 citation statements)

References 23 publications

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“…It was pointed out in [35] that the late-time spectrum has vanishing wave functions while its k 0 dependence is diverging, which looks quite consistent with our results of the divergence of the two-point functions. It is interesting to seek for a relation of our BSFT approach to the creation of open strings due to the change of the vacua in the conformal field theories [33].…”

Section: Summary and Discussionsupporting

confidence: 93%

Brane Decay and Death of Open Strings

Hashimoto

Terashima

2004

J. High Energy Phys.

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Abstract:We show how open strings cease to propagate when unstable D-branes decay. The information on the propagation is encoded in BSFT two-point functions for arbitrary profiles of open string excitations. We evaluate them in tachyon condensation backgrounds corresponding to (i) static spatial tachyon kink (= lower dimensional BPS D-brane) and (ii) homogeneous rolling tachyon. For (i) the propagation is restricted to the directions along the tachyon kink, while for (ii) all the open string excitations cease to propagate at late time and are subject to a collapsed light cone characterized by Carrollian contraction of Lorentz group.

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Section: Summary and Discussionsupporting

confidence: 93%

Brane Decay and Death of Open Strings

Hashimoto

Terashima

2004

J. High Energy Phys.

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“…The analagous context of quantum field theory with exponentially growing mass again suggests that the string states will become lifted (effectively go to infinite mass) in an appropriate sense; moreover an interesting BRST anomaly appears which may limit the consistency of such vacua in the string theory context. (See [38] for some discussion of the issue in field theory).…”

Section: Vacuum Amplitude and Back Reactionmentioning

confidence: 99%

The tachyon at the end of the universe

McGreevy¹,

Silverstein²

2005

J. High Energy Phys.

126

241

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We show that a tachyon condensate phase replaces the spacelike singularity in certain cosmological and black hole spacetimes in string theory. We analyze explicitly a set of examples with flat spatial slices in various dimensions which have a winding tachyon condensate, using worldsheet path integral methods from Liouville theory. In a vacuum with no excitations above the tachyon background in the would-be singular region, we analyze the production of closed strings in the resulting state in the bulk of spacetime. We find a thermal result reminiscent of the Hartle-Hawking state, with tunably small energy density. The amplitudes exhibit a self-consistent truncation of support to the weakly-coupled small-tachyon region of spacetime. We argue that the background is accordingly robust against back reaction, and that the resulting string theory amplitudes are perturbatively finite, indicating a resolution of the singularity and a mechanism to start or end time in string theory. Finally, we discuss the generalization of these methods to examples with positively curved spatial slices.

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“…More examples for interesting questions in the present context concern: Flows under relevant perturbations (see e.g. [28,29]), the inclusion of marginal boundary perturbations, extension to non-compact groups (see e.g. [30,31]) and many others.…”

Section: Discussionmentioning

confidence: 99%

D‐branes in a marginally deformed WZW model

Förste

2003

Fortschritte der Physik

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In this talk we discuss symmetry preserving D-branes on a line of a marginally deformed SU(2) WZW model. A semiclassical and a quantum theoretical approach are presented.This talk is based on the publications [1,2]. I thank Daniel Roggenkamp for a very enjoyable collaboration on[2]. OutlineAfter giving a short introduction and motivation I will present the semiclassical description of D-branes in the marginally deformed SU(2) model. The second part of the talk addresses the quantum theoretical description of the D-branes reporting results which will be derived in more detail in [2]. I will finish with some concluding remarks. Introduction and MotivationLet us first discuss the exact marginal deformations in the case of closed strings. We know that a (perturbative) string vacuum corresponds to a two dimensional conformal field theory (CFT). An operator O is called marginal if it has conformal dimension (1, 1). A typical example of a marginal operator is the product of a chirally conserved current times an anti-chirally conserved current. An infinitesimal perturbation of the action by a worldsheet integral over a marginal operator preserves conformal invariance. Under certain circumstances[3] the infinitesimal perturbation can be integrated up to a finite exact marginal deformation. This results in a one parameter family of CFTs, where two adjacent points on that line are connected by an infinitesimal marginal perturbation. Hence, exact marginal deformations yield a line in the space of string vacua and thus help to gain insight into the structure of the moduli space of string theories. The inclusion of D-branes into this picture provides information about the moduli space of string theories in the presence of D-branes. The inclusion of D-branes means that we investigate CFTs on a worldsheet with boundaries. Such a theory could also be perturbed by marginal boundary operators. Deformations resulting from such a perturbation will not be discussed in the present talk.

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On minisuperspace models of S-branes

Cited by 48 publications

References 23 publications

Brane Decay and Death of Open Strings

Brane Decay and Death of Open Strings

The tachyon at the end of the universe

D‐branes in a marginally deformed WZW model

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