Precision Microstate Counting of Small Black Rings

Abstract

We examine certain two-charge supersymmetric states with spin in five-dimensional string theories which can be viewed as small black rings when the gravitational coupling is large. Using the 4D-5D connection, these small black rings correspond to four-dimensional non-spinning small black holes. Using this correspondence, we compute the degeneracy of the microstates of the small black rings exactly and show that it is in precise agreement with the macroscopic degeneracy to all orders in an asymptotic expansion. Furthermore, we analyze the five-dimensional small black ring geometry and show qualitatively that the Regge bound arises from the requirement that closed time-like curves be absent.

4 pages, LaTeX, references added

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• Supertubes in Bubbling Backgrounds: Born-Infeld Meets Supergravity
• Moulting Black Holes
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• Fundamental Superstrings as Holograms
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