論文

査読有り
2001年

Naked singularities and quantum gravity

Physical Review D
  • Tomohiro Harada
  • ,
  • Hideo Iguchi
  • ,
  • Ken-Ichi Nakao
  • ,
  • T. P. Singh
  • ,
  • Takahiro Tanaka
  • ,
  • Cenalo Vaz

64
4
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevD.64.041501

There are known models of spherical gravitational collapse in which the collapse ends in a naked shell-focusing singularity for some initial data. If a massless scalar field is quantized on the classical background provided by such a star, it is found that the outgoing quantum flux of the scalar field diverges in the approach to the Cauchy horizon. We argue that the semiclassical approximation (i.e., quantum field theory on a classical curved background) used in these analyses ceases to be valid about one Planck time before the epoch of naked singularity formation, because by then the curvature in the central region of the star reaches the Planck scale. It is shown that during the epoch in which the semiclassical approximation is valid, the total emitted energy is about one Planck unit, and is not divergent. We also argue that back reaction in this model does not become important so long as gravity can be treated classically. It follows that the further evolution of the star will be determined by quantum gravitational effects, and without invoking quantum gravity it is not possible to say whether the star radiates away on a short time scale or settles down into a black hole state. ©2001 The American Physical Society.

リンク情報
DOI
https://doi.org/10.1103/PhysRevD.64.041501
ID情報
  • DOI : 10.1103/PhysRevD.64.041501
  • ISSN : 0556-2821
  • SCOPUS ID : 0035881595

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