Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244369
Type: Artigo
Title: Scattering by a topological defect connecting two asymptotically Minkowski spacetimes
Author: Pitelli, J. P. M.
Mosna, R. A.
Abstract: We study the stability and the scattering properties of a spacetime with a topological defect along a spherical bubble. This bubble connects two flat spacetimes which are asymptotically Minkowski, so that the resulting universe may be regarded as containing a wormhole. Its distinguished feature is the absence of exotic matter, i.e., its matter content respects all the energy conditions. Although this wormhole is nontraversable, waves and quantum particles can tunnel between both universes. Interestingly enough, the wave equation alone does not uniquely determine the evolution of scalar waves on this background, and the theory of self-adjoint extensions of symmetric operators is required to find the relevant boundary conditions in this context. Here we show that, for a particular boundary condition, this spacetime is stable and gives rise to a scattering pattern which is identical to the more usual thin-shell wormhole composed of exotic matter. Other boundary conditions of interest are also analyzed, including an unstable configuration with sharp resonances at well-defined frequencies.
We study the stability and the scattering properties of a spacetime with a topological defect along a spherical bubble. This bubble connects two flat spacetimes which are asymptotically Minkowski, so that the resulting universe may be regarded as containing a wormhole. Its distinguished feature is the absence of exotic matter, i.e., its matter content respects all the energy conditions. Although this wormhole is nontraversable, waves and quantum particles can tunnel between both universes. Interestingly enough, the wave equation alone does not uniquely determine the evolution of scalar waves on this background, and the theory of self-adjoint extensions of symmetric operators is required to find the relevant boundary conditions in this context. Here we show that, for a particular boundary condition, this spacetime is stable and gives rise to a scattering pattern which is identical to the more usual thin-shell wormhole composed of exotic matter. Other boundary conditions of interest are also analyzed, including an unstable configuration with sharp resonances at well-defined frequencies.
Subject: Espalhamento (Física)
Relatividade geral (Fisica)
Teoria quântica de campos
Operadores auto-adjuntos
Country: Estados Unidos
Editor: American Physical Society
Citation: Scattering By A Topological Defect Connecting Two Asymptotically Minkowski Spacetimes. Amer Physical Soc, v. 91, p. Jun-2015.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.91.124025
Address: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.124025
Date Issue: 2015
Appears in Collections:IMECC - Artigos e Outros Documentos

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