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Type: Artigo
Title: Scattering cross section and stability of global monopoles
Author: Pitelli, J. P. M.
Barroso, V. S.
Richartz, Mauricio
Abstract: We study the scattering of scalar waves propagating on the global monopole background. Since the scalar wave operator in this topological defect is not essentially self-adjoint, its solutions are not uniquely determined until a boundary condition at the origin is specified. As we show, this boundary condition manifests itself in the differential cross section and can be inferred by measuring the amplitude of the backscattered wave. We further demonstrate that whether or not the spacetime is stable under scalar perturbations also depends on the chosen boundary condition. In particular, we identify a class of such boundary conditions that significantly affects the differential cross section without introducing an instability.
Subject: Espalhamento (Física)
Operadores auto-adjuntos
Propagação de ondas
Perturbações cosmológicas escalares
Scattering (Physics)
Self-adjoint operators
Wave propagation
Scalar cosmological perturbations
Country: Estados Unidos
Editor: American Physical Society
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.96.105021
Date Issue: 2017
Appears in Collections:FCM - Artigos e Outros Documentos
IMECC - Artigos e Outros Documentos

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