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Observer-dependent D-brane for strings propagating in pp-wave time-dependent background

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Abstract

We study the type IIB superstring in a pp-wave time-dependent background, which has a singularity at t=0. We show that this background can provide a toy model to study some ideas related to the stretched horizon paradigm and the complementary principle of black holes. To this end, we construct a unitary Bogoliubov generator that relates the asymptotically flat string Hilbert space, defined at t=±∞, to the finite time Hilbert space. For asymptotically flat observers, the closed string vacuum close to the singularity appears as a boundary state, which is in fact a D-brane described in the closed string channel. However, observers who go with the string towards the singularity see the original vacuum.

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Authors and Affiliations

  1. Universidade Federal do Pampa – UNIPAMPA, Rua Carlos Barbosa s/n, Bairro Getúlio Vargas, CEP 96412-420, Bagé, RS, Brazil

    D.Z. Marchioro & D.L. Nedel

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  1. D.Z. Marchioro
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  2. D.L. Nedel
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Correspondence to D.Z. Marchioro.

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Marchioro, D., Nedel, D. Observer-dependent D-brane for strings propagating in pp-wave time-dependent background. Eur. Phys. J. C 55, 343–347 (2008). https://doi.org/10.1140/epjc/s10052-008-0569-7

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  • DOI: https://doi.org/10.1140/epjc/s10052-008-0569-7

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