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|Title:||Scattering cross section and stability of global monopoles|
|Author:||Pitelli, J. P. M.|
Barroso, V. S.
|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.|
Propagação de ondas
Perturbações cosmológicas escalares
Scalar cosmological perturbations
|Editor:||American Physical Society|
|Appears in Collections:||FCM - Artigos e Outros Documentos|
IMECC - Artigos e Outros Documentos
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