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- W2759893954 abstract "We investigate graviton radiation in gravitational scattering at small impact parameters $b<Requiv 2Gsqrt{s}$ and extreme energies $sgg M_P^2$, a regime in which classical collapse is thought to occur, and thus radiation may be suppressed also. Here however, by analyzing the soft-based representation of radiation recently proposed in the semiclassical ACV framework, we argue that gravitons can be efficiently produced in the untrapped region $|boldsymbol{x}|gtrsim R>b$, so as to suggest a possible completion of the unitarity sum. In fact, such energy radiation at large distances turns out to compensate and to gradually reduce to nothing the amount of energy $E'$ being trapped at small-$b$'s, by thus avoiding the quantum tunneling suppression of the elastic scattering and suggesting a unitary evolution. We finally look at the coherent radiation sample so obtained and we find that, by energy conservation, it develops an exponential frequency damping corresponding to a quasi-temperature of order $hbar/R$, which is naturally related to a Hawking radiation and is suggestive of a black-hole signal at quantum level." @default.
- W2759893954 created "2017-10-06" @default.
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- W2759893954 date "2017-12-14" @default.
- W2759893954 modified "2023-09-25" @default.
- W2759893954 title "Unitarity restoring graviton radiation in the collapse regime of gravitational scattering" @default.
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- W2759893954 doi "https://doi.org/10.1103/physrevd.96.126008" @default.
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