New perspectives on Hawking radiation

Abstract

We develop an adiabatic formalism to study the Hawking phenomenon from the perspective of Unruh-DeWitt detectors moving along non-stationary, non-asymptotic trajectories. When applied to geodesic trajectories, this formalism yields the following results: (i) though they have zero acceleration, the temperature measured by detectors on circular orbits is higher than that measured by static detectors at the same distance from the hole, and diverges on the photon sphere, (ii) in the near-horizon region, both outgoing and incoming modes excite infalling detectors, and, for highly bound trajectories (E<<1), the latter actually dominate the former. We confirm the apparent perception of high-temperature Hawking radiation by infalling observers with E<<1 by showing that the energy flux measured by these observers diverges in the E->0 limit. We close by a discussion of the role played by spacetime curvature on near-horizon Hawking radiation.

14 pages, 7 figures

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• Cosmic Matter Flux May Turn Hawking Radiation Off
• Particle creation from the quantum stress tensor
• Non-equilibrium thermodynamics of gravitational screens
• A tensorial description of particle perception in black-hole physics
• Something special at the event horizon
• Response of an Unruh-DeWitt detector near an extremal black hole
• Effect of tidal curvature on dynamics of accelerated probes
• On the Unruh effect, trajectories and information
• Evaporating black-holes, wormholes, and vacuum polarisation: must they always conserve charge?
• More Excitement Across the Horizon
• Remarks on distinguishability of Schwarzschild spacetime and thermal Minkowski spacetime using Resonance Casimir-Polder interaction
• Unruh effect for inertial observers through vacuum correlations
• What Hawking Radiation Looks Like as You Fall into a Black Hole
• The effective Tolman temperature in curved spacetimes
• Harvesting Fermionic Field Entanglement in Schwarzschild Spacetime
• Atom-field dynamics in curved spacetime
• Free-fall energy density and flux in the Schwarzschild black hole
• Quantum frictionless trajectories versus geodesics
• Excavations at the gravitationally collapsed site: Recent findings
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• On the Origin of Black Hole Paradoxes
• Emergent Hawking Radiation and Quantum Sensing in a Quenched Chiral Spin Chain
• Thermal scalar field stress tensor on a two dimensional black hole and its near horizon properties
• Observables in quantum field theory on a collapsing black hole background