New perspectives on Hawking radiation

Matteo Smerlak and Suprit Singh
Phys. Rev. D 88, 104023 – Published 21 November 2013

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 (E1), the latter actually dominate the former. We confirm the apparent perception of high-temperature Hawking radiation by infalling observers with E1 by showing that the energy flux measured by these observers diverges in the E0 limit. We close with a discussion of the role played by spacetime curvature on the near-horizon Hawking radiation.

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  • Received 11 April 2013

DOI:https://doi.org/10.1103/PhysRevD.88.104023

© 2013 American Physical Society

Authors & Affiliations

Matteo Smerlak1,* and Suprit Singh2,†

  • 1Max-Planck-Institut für Gravitationsphysik, Am Mühlenberg 1, D-14476 Golm, Germany
  • 2Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune 411 007, India

  • *smerlak@aei.mpg.de
  • suprit@iucaa.ernet.in

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Issue

Vol. 88, Iss. 10 — 15 November 2013

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