Breaking the sound barrier in holography

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Hoyos , C , Jokela , N , Rodriguez Fernandez , D & Vuorinen , A 2016 , ' Breaking the sound barrier in holography ' , Physical Review D , vol. 94 , no. 10 , 106008 .

Title: Breaking the sound barrier in holography
Author: Hoyos, Carlos; Jokela, Niko; Rodriguez Fernandez, David; Vuorinen, Aleksi
Contributor organization: Department of Physics
Helsinki Institute of Physics
Date: 2016-11-15
Language: eng
Number of pages: 21
Belongs to series: Physical Review D
ISSN: 2470-0010
Abstract: It has been conjectured that the speed of sound in holographic models with UV fixed points has an upper bound set by the value of the quantity in conformal field theory. If true, this would set stringent constraints for the presence of strongly coupled quark matter in the cores of physical neutron stars, as the existence of two-solar-mass stars appears to demand a very stiff equation of state. In this article, we present a family of counterexamples to the speed of sound conjecture, consisting of strongly coupled theories at finite density. The theories we consider include N = 4 super Yang-Mills at finite R-charge density and nonzero gaugino masses, while the holographic duals are Einstein-Maxwell theories with a minimally coupled scalar in a charged black hole geometry. We show that for a small breaking of conformal invariance, the speed of sound approaches the conformal value from above at large chemical potentials.
114 Physical sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: publishedVersion

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