Removing Singularities

Abstract

Big bang/crunch curvature singularities in exact CFT string backgrounds can be removed by turning on gauge fields. This is described within a family of {SL(2)xSU(2)xU(1)_x}/{U(1)xU(1)} quotient CFTs. Uncharged incoming wavefunctions from the ``whiskers'' of the extended universe can be fully reflected if and only if a big bang/crunch curvature singularity, from which they are scattered, exists. Extended BTZ-like singularities remain as long as U(1)_x is compact.

21 pages, harvmac

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• Time-dependent Orbifolds and String Cosmology
• Cosmological Perturbations in a Big Crunch/Big Bang Space-time
• Current-Current Deformations of Conformal Field Theories, and WZW Models
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• A Short Review of Time Dependent Solutions and Space-like Singularities in String Theory
• Strings in Singular Time-Dependent Backgrounds
• Bouncing Braneworlds Go Crunch!
• On the Classical Stability of Orientifold Cosmologies
• Quotients of AdS_{p+1} x S^q: causally well-behaved spaces and black holes
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• Closed Strings in Misner Space: Stringy Fuzziness with a Twist
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• Beyond the Singularity of the 2-D Charged Black Hole
• Strings in an electric field, and the Milne Universe
• Flow of Geometries and Instantons on the Null Orbifold
• World-sheet duality for D-branes with travelling waves
• Open strings in relativistic ion traps
• On Thermodynamical Properties of Some Coset CFT Backgrounds
• Unitarity in the Presence of Closed Timelike Curves
• Solvable time-like cosets and holography beyond $AdS$
• Bridging Worldsheet CFTs and Wormholes