From big bang to big crunch and beyond

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Abstract

We study a quotient Conformal Field Theory, which describes a 3 + 1 dimensional cosmological spacetime. Part of this spacetime is the Nappi-Witten (NW) universe, which starts at a "big bang" singularity, expands and then contracts to a "big crunch" singularity at a finite time. The gauged WZW model contains a number of copies of the NW spacetime, with each copy connected to the preceeding one and to the next one at the respective big bang/big crunch singularities. The sequence of NW spacetimes is further connected at the singularities to a series of non-compact static regions with closed timelike curves. These regions contain boundaries, on which the observables of the theory live. This suggests a holographic interpretation of the physics. © SISSA/ISAS 2002.

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Elitzur, S., Giveon, A., Kutasov, D., & Rabinovici, E. (2002). From big bang to big crunch and beyond. Journal of High Energy Physics, 6(6), 313–343. https://doi.org/10.1088/1126-6708/2002/06/017

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