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Breaking the sound barrier in AdS/CFT
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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 ${\cal N}=4$ super Yang-Mills at finite R-charge density and non-zero 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.
Forward citations
Cited by 2 Pith papers
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Dynamics of a Higgs phase transition in the Klebanov-Witten theory
In the holographic Klebanov-Witten plasma, D5-brane bubbles nucleate with a preferred flux that grows as 1/(T-Tc)^2, and their walls move at speeds below the conformal sound speed.
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Holographic fundamental matter in multilayered media
A top-down holographic D3-D5-D7 construction yields anisotropic thermodynamics and distinct in-plane and off-plane sound and diffusion modes for strongly coupled layered matter with fundamental flavors.
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