In a thermal (canonical) ensemble, Schwarzian quantum-gravity corrections enhance the low-temperature decoherence rate of superpositions near near-extremal Reissner-Nordström black holes, while in a fixed-energy (microcanonical) ensemble the rate matches the semiclassical value.
Greybody Factors for Black Holes in Four Dimensions: Particles with Spin
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abstract
We compute the emission spectrum of minimally coupled particles with spin that are Hawking radiated from four dimensional black holes in string theory. For a range of the black hole parameters the result has a product structure that may be interpreted in terms of the respective right- and left-moving thermal correlation functions of an effective string model. For spin-one and spin-two particles a novel cancellation between contributions to the wave function is needed to ensure this outcome. The form of the spectra suggests that the four-dimensional effective string description is ``heterotic'': particles with spin are emitted from the right-moving sector, only.
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Decoherence of quantum superpositions in near-extremal Reissner-Nordstr\"om black holes with quantum gravity corrections
In a thermal (canonical) ensemble, Schwarzian quantum-gravity corrections enhance the low-temperature decoherence rate of superpositions near near-extremal Reissner-Nordström black holes, while in a fixed-energy (microcanonical) ensemble the rate matches the semiclassical value.