Stiff phases in strongly coupled gauge theories with holographic duals

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 $v_s=1/\sqrt{3}$. 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.

arXiv comment22 pages+appendices, 12 figures

References in corpus (32)

• Gauge Theory Correlators from Non-Critical String Theory
• The Large N Limit of Superconformal Field Theories and Supergravity
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• NJL-model analysis of dense quark matter
• Adding flavor to AdS/CFT
• Equation of state and neutron star properties constrained by nuclear physics and observation
• Neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory
• Sound velocity bound and neutron stars
• Constraining neutron star matter with QCD
• AdS/CFT correspondence, quasinormal modes, and thermal correlators in N=4 SYM
• The pressure of QCD at finite temperatures and chemical potentials
• Cold Nuclear Matter In Holographic QCD
• Holographic Nuclear Physics
• Holographic Renormalization of Probe D-Branes in AdS/CFT
• Hydrodynamics of Holographic Superconductors
• Holographic Thermodynamics at Finite Baryon Density: Some Exact Results
• Striped instability of a holographic Fermi-like liquid
• A bound on the speed of sound from holography
• Cool quark matter
• Dynamical vs. equilibrium properties of the QCD phase transition: a holographic perspective
• Holographic quark matter and neutron stars
• From holography towards real-world nuclear matter
• Hyperscaling-Violation on Probe D-Branes
• Baryonic Popcorn
• Dense Holographic QCD in the Wigner-Seitz Approximation
• Notes on Properties of Holographic Matter
• Collective excitations of massive flavor branes
• Phases of kinky holographic nuclear matter
• Thermodynamic Properties of Holographic Multiquark and the Multiquark Star
• Holographic cold nuclear matter and neutron star
• Explicit flavor symmetry breaking and holographic compact stars

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• Holographic QCD in the Veneziano limit and neutron stars
• Dark Sector to Restore Cosmological Concordance
• A general, scale-independent description of the sound speed in neutron stars
• Holographic modeling of nuclear matter and neutron stars
• Holographic compact stars meet gravitational wave constraints
• Hybrid and quark star matter based on a non-perturbative equation of state
• Unified weak/strong coupling framework for nuclear matter and neutron stars
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• Holographic approach to transport in dense QCD matter
• Gravitational waves from a holographic phase transition
• Insights on the peak in the speed of sound of ultradense matter
• Novel color superconducting phases of $\mathcal{N}$ = 4 super Yang-Mills at strong coupling
• Neutron stars and phase diagram in a hard-wall AdS/QCD model
• Gravity dual of a multilayer system
• Brane nucleation instabilities in non-AdS/non-CFT
• Aspects of univalence in holographic axion models
• Quantum information probes of charge fractionalization in large-$N$ gauge theories
• Holographic fundamental matter in multilayered media
• Scattering length in holographic confining theories
• Scattering length from holographic duality
• Flavored anisotropic black holes
• Insensitivity of the complexity rate of change to the conformal anomaly and Lloyd's bound as a possible renormalization condition
• Effects of a Brueckner-Hartree-Fock-corrected effective mass on speed of sound, conformality, and observables of dark matter-admixed neutron stars
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