Janus black holes

Dongsu Bak, Michael Gutperle, Romuald A. Janik

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


In this paper Janus black holes in AdS3 are considered. These are static solutions of an Einstein-scalar system with broken translation symmetry along the horizon. These solutions are dual to interface conformal field theories at finite temperature. An approximate solution is first constructed using perturbation theory around a planar BTZ black hole. Numerical and exact solutions valid for all sets of parameters are then found and compared. Using the exact solution the thermodynamics of the system is analyzed. The entropy associated with the Janus black hole is calculated and it is found that the entropy of the black Janus is the sum of the undeformed black hole entropy and the entanglement entropy associated with the defect.

Original languageEnglish
Article number56
JournalJournal of High Energy Physics
Issue number10
StatePublished - Oct 2011


  • AdS-CFT Correspondence
  • Black Holes
  • Black Holes in String Theory


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