Strings in a 2-d extremal black hole

Amit Giveon*, Amit Sever

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


String theory on 2-d charged black holes corresponding to SL(2) × U(1)L/U(1) exact asymmetric quotient CFTs are investigated. These backgrounds can be embedded, in particular, in a two dimensional heterotic string. In the extremal case, the quotient CFT description captures the near horizon physics, and is equivalent to strings in AdS2 with a gauge field. Such string vacua possess an infinite space-time Virasoro symmetry, and hence enhancement of global space-time Lie symmetries to affine symmetries, in agreement with the conjectured AdS2/CFT1 correspondence. We argue that the entropy of these 2-d black holes in string theory is compatible with semi-classical results, and show that in perturbative computations part of an incoming flux is absorbed by the black hole. Moreover, on the way we find evidence that the 2-d heterotic string is closely related to the N = (2, 1) string, and conjecture that they are dual [3].

Original languageAmerican English
Pages (from-to)1599-1619
Number of pages21
JournalJournal of High Energy Physics
Issue number2
StatePublished - Feb 2005


  • AdS-CFT and dS-CFT Correspondence
  • Black Holes in String Theory
  • Conformal Field Models in String Theory
  • Superstrings and Heterotic Strings


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