Signatures of energy flux in particle production: a black hole birth cry and death gasp

Michael R.R. Good, Yen Chin Ong

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Abstract: It is recently argued that if the Hawking radiation process is unitary, then a black hole’s mass cannot be monotonically decreasing. We examine the time dependent particle count and negative energy flux in the non-trivial conformal vacuum via the moving mirror approach. A new, exactly unitary solution is presented which emits a characteristic above-thermal positive energy burst, a thermal plateau, and negative energy flux. It is found that the characteristic positive energy flare and thermal plateau is observed in the particle outflow. However, the results of time dependent particle production show no overt indication of negative energy flux. Therefore, a black hole’s birth cry is detectable by asymptotic observers via particle count, whereas its death gasp is not.

Original languageEnglish
Article number145
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - Jul 31 2015


  • Black Holes
  • Classical Theories of Gravity

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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