Hawking radiation from extremal and nonextremal black holes

R. Balbinot, A. Fabbri, S. Farese, and R. Parentani
Phys. Rev. D 76, 124010 – Published 7 December 2007

Abstract

The relationship between Hawking radiation emitted by nonextremal and extremal Reissner-Nordström black holes is critically analyzed. A careful study of a series of regular collapsing geometries reveals that the stress energy tensor stays regular in the extremal limit and is smoothly connected to that of nonextremal black holes. The unexpected feature is that the late time transients which played little role in the nonextremal case are necessary to preserve the well-defined character of the flux in the extremal case. The known singular behavior of the static energy density of extremal black holes is recovered from our series by neglecting these transients, when performing what turns out to be an illegitimate late time limit. Although our results are derived in two-dimensional settings, we explain why they should also apply to higher dimensional black holes.

  • Received 2 October 2007

DOI:https://doi.org/10.1103/PhysRevD.76.124010

©2007 American Physical Society

Authors & Affiliations

R. Balbinot1,*, A. Fabbri2,†, S. Farese2,‡, and R. Parentani3,§

  • 1Dipartimento di Fisica dell’Università di Bologna and INFN sezione di Bologna, 40126 Bologna, Italy
  • 2Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC. Facultad de Física, Universidad de Valencia, 46100, Burjassot, Valencia, Spain
  • 3Laboratoire de Physique Théorique, CNRS UMR 8627, Bât. 210, Université Paris XI, 91405 Orsay Cedex, France

  • *balbinot@bo.infn.it
  • afabbri@ific.uv.es
  • Sara.Farese@uv.es
  • §parenta@th.u-psud.fr

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Issue

Vol. 76, Iss. 12 — 15 December 2007

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