Islands in proliferating de Sitter spaces

Jong Hyun Baek, Kang Sin Choi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We study two-dimensional de Sitter universe which evolves and proliferates according to the Ginsparg-Perry-Bousso-Hawking mechanism, using Jackiw-Teitelboim gravity coupled to conformal matter. Black holes are generated by quantum gravity effects from pure de Sitter space and then evaporate to yield multiple disjoint de Sitter spaces. The back-reaction from the matter CFT is taken into account for the dilaton as a function of the temperature of the CFT. We discuss the evaporation of black holes and calculate the finite temperature entropy of an inflating region using the island formula. We find that the island moves towards the apparent horizon of the black hole as the temperature increases. The results are applied to the case of multiple evaporating black holes, for which we suggest multiple islands.

Original languageEnglish
Article number98
JournalJournal of High Energy Physics
Issue number5
StatePublished - May 2023

Bibliographical note

Funding Information:
This work is supported by the grant NRF-2018R1A2B2007163 of National Research Foun- dation of Korea.

Publisher Copyright:
© 2023, The Author(s).


  • 2D Gravity
  • Black Holes
  • de Sitter space


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