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• W2894912225 startingPage "1833" @default.
• W2894912225 abstract "Some exotic compact objects possess evanescent ergosurfaces: timelike submanifolds on which a Killing vector field, which is timelike everywhere else, becomes null. We show that any manifold possessing an evanescent ergosurface but no event horizon exhibits a linear instability of a peculiar kind: either there are solutions to the linear wave equation which concentrate a finite amount of energy into an arbitrarily small spatial region, or the energy of waves measured by a stationary family of observers can be amplified by an arbitrarily large amount. In certain circumstances we can rule out the first type of instability. We also provide a generalisation to asymptotically Kaluza-Klein manifolds. This instability bears some similarity with the ergoregion instability of Friedman, and we use many of the results from the recent proof of this instability by Moschidis." @default.
• W2894912225 created "2018-10-12" @default.
• W2894912225 creator A5030134282 @default.
• W2894912225 date "2020-09-12" @default.
• W2894912225 modified "2023-09-25" @default.
• W2894912225 title "Evanescent ergosurface instability" @default.
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• W2894912225 doi "https://doi.org/10.2140/apde.2020.13.1833" @default.
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