Do event horizons exist?

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Event horizons are the defining feature of classical black holes. They are the key ingredient of the information loss paradox which, as paradoxes in quantum foundations, is built on a combination of predictions of quantum theory and counterfactual classical features: neither horizon formation nor its crossing by a test body can be detected by a distant observer. Furthermore, horizons are unnecessary for the production of Hawking-like radiation. We demonstrate that when this radiation is taken into account, it can prevent horizon crossing/formation in a large class of models. We conjecture that horizon avoidance is a general feature of collapse. The nonexistence of event horizons dispels the paradox, but opens up important questions about thermodynamic properties of the resulting objects and correlations between different degrees of freedom.

Original languageEnglish
Article number1743008
Pages (from-to)1-6
Number of pages6
JournalInternational Journal of Modern Physics D
Issue number12
Publication statusPublished - 1 Oct 2017


  • Black holes
  • event horizon
  • information loss


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