Holographic Quark Matter and Neutron Stars

Hoyos, Carlos; Jokela, Niko; Fernández, David Rodríguez; Vuorinen, Aleksi

doi:10.1103/physrevlett.117.032501

Cited by 77 publications

(101 citation statements)

References 73 publications

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“…Indeed, in a recent study of hybrid neutron stars by the present authors [19], where a holographic EoS was constructed for the quark matter phase, it was discovered that the stars became unstable as soon as even a microscopic amount of quark matter was present in their cores. This was attributed to a very strong first order deconfining phase transition in the model, which was ultimately due to the relatively low stiffness of the conformal quark matter EoS, corresponding to v 2 s = 1/3.…”

Section: Introductionmentioning

confidence: 83%

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Breaking the sound barrier in holography

et al. 2016

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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 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.

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Section: Introductionmentioning

confidence: 83%

“…In this context, a highly promising avenue is the application of the holographic duality [8], which has indeed been lately applied to the description of both the nuclear [9][10][11][12][13][14][15][16] and quark matter [17][18][19] phases inside a neutron star.…”

Section: Introductionmentioning

confidence: 99%

Breaking the sound barrier in holography

et al. 2016

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“…We believe that our work sets the standard and sparks many other investigations in the future. One particularly interesting case is in the context of the astrophysics of compact objects where anisotropy seems to offer clues regarding the "universal relations" for neutron stars [110] and the already established holographic modeling of isotropic matter [69,[111][112][113][114][115][116].…”

Section: Discussionmentioning

confidence: 99%

Holographic fundamental matter in multilayered media

Gran

Jokela

Musso

et al. 2019

J. High Energ. Phys.

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We describe a strongly coupled layered system in 3+1 dimensions by means of a top-down D-brane construction. Adjoint matter is encoded in a large-N c stack of D3-branes, while fundamental matter is confined to (2 + 1)-dimensional defects introduced by a large-N f stack of smeared D5-branes. To the anisotropic Lifshitz-like background geometry, we add a single flavor D7-brane treated in the probe limit. Such bulk setup corresponds to a partially quenched approximation for the dual field theory. The holographic model sheds light on the anisotropic physics induced by the layered structure, allowing one to disentangle flavor physics along and orthogonal to the layers as well as identifying distinct scaling laws for various dynamical quantities. We study the thermodynamics and the fluctuation spectrum with varying valence quark mass or baryon chemical potential. We also focus on the density wave propagation in both the hydrodynamic and collisionless regimes where analytic methods complement the numerics, while the latter provides the only resource to address the intermediate transition

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“…With lattice QCD suffering from the infamous Sign Problem [3] and the applicability of Chiral Effective Theory (CET) extending only up to roughly the nuclear matter saturation density [4], there is an urgent need to find complementary methods for tackling strongly coupled matter at the the highest densities reached within the stars. This has motivated attempts to approach the problem using methods ranging from the Functional Renormalization Group to phenomenological models and the holographic duality [5][6][7][8][9][10], but they all come with their own systematic uncertainties and limitations.…”

Section: Introductionmentioning

confidence: 99%

Quark Matter Equation of State from Perturbative QCD

Vuorinen

2017

EPJ Web Conf.

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Abstract. In this proceedings contribution, we discuss recent developments in the perturbative determination of the Equation of State of dense quark matter, relevant for the microscopic description of neutron star cores. First, we introduce the current state of the art in the problem, both at zero and small temperatures, and then present results from two recent perturbative studies that pave the way towards extending the EoS to higher orders in perturbation theory.

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Holographic Quark Matter and Neutron Stars

Cited by 77 publications

References 73 publications

Breaking the sound barrier in holography

Breaking the sound barrier in holography

Holographic fundamental matter in multilayered media

Quark Matter Equation of State from Perturbative QCD

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