Fractional Branes and the Entropy of 4D Black Holes

Abstract

We reconsider the four dimensional extremal black hole constructed in type IIB string theory as the bound state of D1-branes, D5-branes, momentum, and Kaluza-Klein monopoles. Specifically, we examine the case of an arbitrary number of monopoles. Consequently, the weak coupling calculation of the microscopic entropy requires a study of the D1-D5 system on an ALE space. We find that the complete expression for the Bekenstein-Hawking entropy is obtained by taking into account the massless open strings stretched between the fractional D-branes which arise in the orbifold limit of the ALE space. The black hole sector therefore arises as a mixed Higgs-Coulomb branch of an effective 1+1 dimensional gauge theory.

12 pages. 1 figure. v2: References added

Cited by in corpus (6)

• Strings, Black Holes, and Quantum Information
• Microstates of the D1-D5-KK System
• The Enhancon, Black Holes, and the Second Law
• The Entropy of 4D Black Holes and the Enhancon
• Rotating Black Holes, Closed Time-Like Curves, Thermodynamics, and the Enhancon Mechanism
• Near-horizon microstates of the D1-D5-P black hole