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Don't panic! closed string tachyons in ALE spacetimes

Allan Adams1,2, Joseph Polchinski2 and Eva Silverstein1,2

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We consider closed string tachyons localized at the fixed points of noncompact nonsupersymmetric orbifolds. We argue that tachyon condensation drives these orbifolds to flat space or supersymmetric ALE spaces. The decay proceeds via an expanding shell of dilaton gradients and curvature which interpolates between two regions of distinct angular geometry. The string coupling remains weak throughout. For small tachyon VEVs, evidence comes from quiver theories on D-branes probes, in which deformations by twisted couplings smoothly connect non-supersymmetric orbifolds to supersymmetric orbifolds of reduced order. For large tachyon VEVs, evidence comes from worldsheet RG flow and spacetime gravity. For Bbb C2/Bbb Zn, we exhibit infinite sequences of transitions producing SUSY ALE spaces via twisted closed string condensation from non-supersymmetric ALE spaces. In a T-dual description this provides a mechanism for creating NS5-branes via closed string tachyon condensation similar to the creation of D-branes via open string tachyon condensation. We also apply our results to recent duality conjectures involving fluxbranes and the type 0 string.


Keywords

Superstrings and Heterotic Strings

Discrete and Finite Symmetries

Superstring Vacua

PACS

11.25.Uv D branes

11.30.Qc Spontaneous and radiative symmetry breaking

11.25.Yb M theory

14.80.-j Other particles (including hypothetical)

Subjects

Particle physics and field theory

Dates

Issue 10 ( 1 October 2001)

Received 2 September 2001, accepted for publication 24 October 2001

Published 11 December 2001



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