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New perspectives on Hawking radiation

Matteo Smerlak
(
- Potsdam, Max Planck Inst.
)
,
Suprit Singh
(
- IUCAA, Pune
)

Apr 10, 2013

13 pages

Published in:

Phys.Rev.D 88 (2013) 10, 104023

Published: Nov 21, 2013

e-Print:

1304.2858 [gr-qc]

DOI:

10.1103/PhysRevD.88.104023

Report number:

AEI-2013-169

View in:

ADS Abstract Service

reference search31 citations

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Abstract: (APS)

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 (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 with a discussion of the role played by spacetime curvature on the near-horizon Hawking radiation.

Note:

14 pages, 7 figures

04.70.Dy
04.62.+v
radiation: Hawking
temperature: Hawking
photon: sphere
trajectory
geodesic
velocity

References(29)

Figures(6)

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