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Cool baryon and quark matter in holographic QCD
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abstract
We establish a holographic bottom-up model which covers both the baryonic and quark matter phases in cold and dense QCD. This is obtained by including the baryons using simple approximation schemes in the V-QCD model, which also includes the backreaction of the quark matter to the dynamics of pure Yang-Mills. We examine two approaches for homogeneous baryon matter: baryons as a thin layer of noninteracting matter in the holographic bulk, and baryons with a homogeneous bulk gauge field. We find that the second approach exhibits phenomenologically reasonable features. At zero temperature, the vacuum, baryon, and quark matter phases are separated by strongly first order transitions as the chemical potential varies. The equation of state in the baryonic phase is found to be stiff, i.e., the speed of sound clearly exceeds the value $c_s^2=1/3$ of conformal plasmas at high baryon densities.
Forward citations
Cited by 8 Pith papers
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Holographic Soliton Crystals for Dense Nuclear Matter and Neutron Stars
A crystal of holographic baryons in the Witten-Sakai-Sugimoto model yields a nuclear-matter equation of state compatible with neutron-star observations.
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Quark flavors in hot and dense holographic QCD: setup and comparison to data
A 2+1 flavor holographic QCD model fitted to lattice thermodynamics predicts a smoother nuclear-to-quark matter transition with lower latent heat than earlier V-QCD models.
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The Tachyon Chern-Simons action with a generic tachyon field, and baryons in V-QCD
General Tachyon-Chern-Simons forms are built via Quillen superconnections for arbitrary tachyon matrices, and baryon number equals the superconnection instanton number even with massive, flavor-dependent quarks.
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Flavour current correlators and the non-Abelian hydrodynamic approximation: the charged sector
Isospin-imbalanced strongly coupled dense matter is shown, via holography, to obey non-Abelian hydrodynamic predictions for current correlators up to the chemical-potential scale, beyond the standard ω,k ≪ T regime.
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Locating the QCD critical point with neutron-star observations
Bayesian analysis of a hybrid holographic EOS with neutron-star constraints locates the QCD critical endpoint at μ≈626 MeV and T≈119 MeV and predicts a strong first-order deconfinement transition at zero temperature.
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Towards holographic color superconductivity in QCD
In the V-QCD holographic model, quark pairing transitions can occur with critical temperatures up to about 30 MeV, but spatially modulated instabilities grow faster and may dominate.
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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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Gravitational Waves from Holographic Neutron Star Mergers
Hybrid SLy plus holographic V-QCD equations of state shift neutron-star merger post-merger gravitational wave peaks to lower frequencies, with f3 most visible near 1.4 solar masses.
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