# Black-Hole Entropy from Supergravity Superstrata States

Abstract : 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.
Document type :
Journal articles

https://hal-cea.archives-ouvertes.fr/cea-01120736
Contributor : Emmanuelle de Laborderie <>
Submitted on : Thursday, February 26, 2015 - 2:38:15 PM
Last modification on : Thursday, February 7, 2019 - 2:48:37 PM

### Identifiers

• HAL Id : cea-01120736, version 1
• ARXIV : 1406.4506

### Citation

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

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