Abstract
We develop an adiabatic formalism to study the Hawking phenomenon from the perspective of Unruh-DeWitt detectors moving along nonstationary, nonasymptotic 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 (), the latter actually dominate the former. We confirm the apparent perception of high-temperature Hawking radiation by infalling observers with by showing that the energy flux measured by these observers diverges in the limit. We close with a discussion of the role played by spacetime curvature on the near-horizon Hawking radiation.
- Received 11 April 2013
DOI:https://doi.org/10.1103/PhysRevD.88.104023
© 2013 American Physical Society