Role of evaporation in gravitational collapse

Valentina Baccetti, Robert B. Mann, Daniel R. Terno

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We investigate the consequences of the collapse-induced radiation anticipated before formation of the event horizon. After reviewing the principles underlying semi-classical analysis of black holes we illustrate them by modelling collapse of evaporating massive thin dust shells using two families of metrics for the exterior geometry: the outgoing Vaidya metric and the retarded Schwarzschild metric. We describe how hypothetical pre-Hawking radiation modifies the equation of motion for the shell. Provided that a non-zero radiation flux is perceived by a distant observer, the shell never gets closer than a certain sub-Planckian distance from the Schwarzschild radius. This distance depends only on the shell's mass and evaporation rate. The stress-energy tensor is everywhere finite, but a comoving observer encounters firewall-like energy density and flux. We emphasize the logical connections between different assumptions within the semi-classical approach and discuss consequences of the apparent contradictions between them.

LanguageEnglish
Article number185005
Pages1-25
Number of pages25
JournalClassical and Quantum Gravity
Volume35
Issue number18
DOIs
Publication statusPublished - 17 Aug 2018

Keywords

  • thin shells
  • pre-Hawking radiation
  • collapse

Cite this

Baccetti, Valentina ; Mann, Robert B. ; Terno, Daniel R. / Role of evaporation in gravitational collapse. In: Classical and Quantum Gravity. 2018 ; Vol. 35, No. 18. pp. 1-25.
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Role of evaporation in gravitational collapse. / Baccetti, Valentina; Mann, Robert B.; Terno, Daniel R.

In: Classical and Quantum Gravity, Vol. 35, No. 18, 185005, 17.08.2018, p. 1-25.

Research output: Contribution to journalArticleResearchpeer-review

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