Instability of de Sitter space under thermal radiation in different vacua

Jinn Ouk Gong, Min Seok Seo

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We study the instability of de Sitter space-time (dS) under thermal radiation in different vacua. We argue that the mode function solution of a scalar field in four-dimensional dS can be separated into the incoming and outgoing modes. Different vacua for dS are realized by different combinations of positive frequency modes assigned to each solution. For a minimally coupled massless scalar field, we explicitly compute the behavior of the mode function and the corresponding energy-momentum tensor in the Unruh vacuum near the horizon, and find that the horizon area increases (decreases) in time when the incoming (outgoing) mode contributes to thermal flux.

Original languageEnglish
Article number042
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
StatePublished - Oct 2021

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© 2021 IOP Publishing Ltd and Sissa Medialab.


  • inflation
  • quantum black holes
  • quantum field theory on curved space


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