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|Type:||Artigo de periódico|
|Title:||Superradiance without event horizons in general relativity|
|Abstract:||Superradiant scattering processes are studied in general relativistic systems which, unlike rotating and/or charged black holes, do not exhibit an event horizon. Inspired by Zel'dovich's seminal works on the amplification of waves by a rotating cylinder, we analyze, in the context of general relativity, the possibility of superradiance for electromagnetic waves reflecting off a rotating star and for charged scalar perturbations impinging on a charged sphere. The role of energy dissipation in these systems is analyzed and compared with the role of the event horizon in black hole superradiance.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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