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• W3127309990 abstract "A bstract We discuss modifications to the Hawking spectrum that arise when the asymptotic states are supertranslated or superrotated. For supertranslations we find nontrivial off-diagonal phases in the two-point correlator although the emission spectrum is eventually left unchanged, as previously pointed out in the literature. In contrast, superrotations give rise to modifications which manifest themselves in the emission spectrum and depend nontrivially on the associated conformal factor at future null infinity. We study Lorentz boosts and a class of superrotations whose conformal factors do not depend on the azimuthal angle on the celestial sphere and whose singularities at the north and south poles have been associated to the presence of a cosmic string. In spite of such singularities, superrotations still lead to finite spectral emission rates of particles and energy which display a distinctive power-law behavior at high frequencies for each angular momentum state. The integrated particle emission rate and emitted power, on the contrary, while finite for boosts, do exhibit ultraviolet divergences for superrotations, between logarithmic and quadratic. Such divergences can be ascribed to modes with support along the cosmic string. In the logarithimic case, corresponding to a superrotation which covers the sphere twice, the total power emitted still presents the Stefan-Boltzmann form but with an effective area which diverges logarithmically in the ultraviolet." @default.
• W3127309990 created "2021-02-15" @default.
• W3127309990 creator A5005593214 @default.
• W3127309990 creator A5070607224 @default.
• W3127309990 date "2021-02-01" @default.
• W3127309990 modified "2023-10-18" @default.
• W3127309990 title "Super-Hawking radiation" @default.
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• W3127309990 doi "https://doi.org/10.1007/jhep02(2021)038" @default.
• W3127309990 hasPublicationYear "2021" @default.
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