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Journal Articles Journal of High Energy Physics Year : 2015

Black-Hole Entropy from Supergravity Superstrata States


There are, by now, several arguments that superstrata, which represent D1-D5-P bound states that depend upon arbitrary functions of two variables and that preserve four supersymmetries, exist in string theory, and that their gravitational back-reaction results in smooth horizonless solutions. In this paper we examine the shape and density modes of the superstratum and give strong evidence that the back-reacted supergravity solution allows for fluctuation modes whose quantization reproduces the entropy growth of black holes as a function of the charges. In particular, we argue that the shape modes of the superstratum that lie purely within the non-compact space-time directions account for at least $1/\sqrt{6}$ of the entropy of the D1-D5-P black hole and propose a way in which the rest of the entropy could be captured by superstratum fluctuations. We complete the picture by conjecturing a relationship between bound states of multiple superstrata and momentum excitations of different twisted sectors of the dual CFT.

Dates and versions

cea-01120736 , version 1 (26-02-2015)



Iosif Bena, Masaki Shigemori, Nicholas P. Warner. Black-Hole Entropy from Supergravity Superstrata States. Journal of High Energy Physics, 2015, 2014 (2014), pp.140. ⟨cea-01120736⟩
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