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Quantum fermion superradiance and vacuum ambiguities on charged black holes
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Unlike a classical charged bosonic field, a classical charged fermion field on a static charged black hole does not exhibit superradiant scattering. We demonstrate that the quantum analogue of this classical process is however present. We construct a vacuum state for the fermion field which has no incoming particles from past null infinity, but which contains, at future null infinity, a nonthermal flux of particles. This state describes both the discharge and energy loss of the black hole, and we analyze how the interpretation of this phenomenon depends on the ambiguities inherent in defining the quantum vacuum.
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Cited by 2 Pith papers
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Quantum fields in boson star spacetime
In boson star spacetimes, the renormalized quantum stress tensor has mostly positive energy density and negative radial pressure that grow with curvature, rivaling the classical stress in the most compact solutions.
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Effective Metric Description of Charged Black Holes
Near-extremal and extremal charged black holes can be described by an effective metric built from the proper time of an infalling observer, with explicit consistency constraints on the deformation parameters.
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