Stiff phases in strongly coupled gauge theories with holographic duals

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Ecker , C , Hoyos , C , Jokela , N , Rodriguez Fernandez , D & Vuorinen , A 2017 , ' Stiff phases in strongly coupled gauge theories with holographic duals ' , Journal of High Energy Physics , vol. 2017 , no. 11 , 031 . https://doi.org/10.1007/JHEP11(2017)031

Title: Stiff phases in strongly coupled gauge theories with holographic duals
Author: Ecker, Christian; Hoyos, Carlos; Jokela, Niko; Rodriguez Fernandez, David; Vuorinen, Aleksi
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-11-08
Language: eng
Number of pages: 34
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/228756
Abstract: According to common lore, Equations of State of field theories with gravity duals tend to be soft, with speeds of sound either below or around the conformal value of v(s) = 1/root 3. This has important consequences in particular for the physics of compact stars, where the detection of two solar mass neutron stars has been shown to require very stiff equations of state. In this paper, we show that no speed limit exists for holographic models at finite density, explicitly constructing examples where the speed of sound becomes arbitrarily close to that of light. This opens up the possibility of building hybrid stars that contain quark matter obeying a holographic equation of state in their cores.
Subject: Gauge-gravity correspondence
Holography and quark-gluon plasmas
114 Physical sciences
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