Strings in a 2-d Extremal Black Hole

Abstract

String theory on 2-d charged black holes corresponding to (SL(2)xU(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 AdS_2 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 AdS_2/CFT_1 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.

1+22 pages, harvmac, 1 eps figure; v2: refs. added, typo corrected

References in corpus (2)

• Heterotic strings on homogeneous spaces
• Superstrings on AdS_2 and Superconformal Matrix Quantum Mechanics

Cited by in corpus (17)

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• Heterotic Strings in Two Dimensions and New Stringy Phase Transitions
• Stable Vacua for Tachyonic Strings
• Heterotic Coset Models of Microscopic Strings and Black Holes
• The Moduli Space and Phase Structure of Heterotic Strings in Two Dimensions
• On Black Fundamental Strings
• AdS2/CFT1, Whittaker vector and Wheeler-De Witt equation
• Superconformal Quantum Mechanics from M2-branes
• Non-critical Heterotic Superstrings in Various Dimensions
• Stringy holography at finite density
• Notes on S-Matrix of Non-critical N=2 String
• Cosmological Constant Seesaw in String/M-Theory
• Bridging Worldsheet CFTs and Wormholes
• One-loop effect in the charged 2D black hole near extremality