Holographic cold nuclear matter as dilute instanton gas

Ghoroku, Kazuo; Kubo, Kouki; Tachibana, Motoi; Taminato, Tomoki; Toyoda, Fumihiko

doi:10.1103/physrevd.87.066006

Cited by 29 publications

(37 citation statements)

References 24 publications

(53 reference statements)

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“…Multi-baryon solutions are also studied in the WSS model [34][35][36][37][38]. For dense baryonic matter in the QCD phase diagram, homogeneous approximations have been utilized in the WSS model [39][40][41][42][43] as well as another approach based on probe branes [44,45]. With these approximations, baryonic matter phases can be realized in the low temperature high-density region in the phase diagram.…”

Section: Contentsmentioning

confidence: 99%

Cool baryon and quark matter in holographic QCD

Ishii

Järvinen

Nijs

2019

J. High Energ. Phys.

114

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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 2 s = 1/3 of conformal plasmas at high baryon densities.

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Section: Contentsmentioning

confidence: 99%

Cool baryon and quark matter in holographic QCD

Ishii

Järvinen

Nijs

2019

J. High Energ. Phys.

114

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“…Here, this is equivalent to gauge field configurations with nonzero topological charge on the connected flavor branes of the model [10], and various properties of baryons in the vacuum have been studied within this approach [10,11,[15][16][17]. Baryonic matter at nonzero density and temperature was first considered in a pointlike approximation of the instantons on the flavor branes [18], and this approach was improved and complemented by a number of studies [12,[19][20][21][22][23][24][25][26][27][28][29][30][31]. (For studies of baryonic matter using a different holographic approach, based on a D3-D7 setup, see for instance Refs.…”

Section: Introductionmentioning

confidence: 99%

Layers of deformed instantons in holographic baryonic matter

Preis

Schmitt

2016

J. High Energ. Phys.

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We discuss homogeneous baryonic matter in the decompactified limit of the Sakai-Sugimoto model, improving existing approximations based on flat-space instantons. We allow for an anisotropic deformation of the instantons in the holographic and spatial directions and for a density-dependent distribution of arbitrarily many instanton layers in the bulk. Within our approximation, the baryon onset turns out to be a second-order phase transition, at odds with nature, and there is no transition to quark matter at high densities, at odds with expectations from QCD. This changes when we impose certain constraints on the shape of single instantons, motivated by known features of holographic baryons in the vacuum. Then, a first-order baryon onset and chiral restoration at high density are possible, and at sufficiently large densities two instanton layers are formed dynamically. Our results are a further step towards describing realistic, strongly interacting matter over a large density regime within a single model, desirable for studies of compact stars.

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“…This phase diagram has also been studied in the presence of baryonic matter represented by sources at the tip of the D8 branes [59], and refinements involving extended, non-point-like baryons have been studied in [60][61][62][63]. Also a very interesting attempt [64] has been made to find a holographic realization of the so-called quarkyonic phase [65,66] within the confined phase.…”

Section: Deconfinement Transition To Black D4 Phase and Chiral Symmetmentioning

confidence: 99%

The Witten-Sakai-Sugimoto model: A brief review and some recent results

Rebhan

2015

EPJ Web of Conferences

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Abstract. A brief review of the Witten-Sakai-Sugimoto model is given, which is a topdown holographic model of low-energy QCD with chiral quarks derived from type-IIA superstring theory. The main predictions of the model, in particular concerning meson spectra, the gluon condensate, the QCD string tension, the mass of the η and of baryons are discussed and compared quantitatively with available experimental and/or lattice results. Then some recent results of potential interest to the physics program at the future FAIR facility are presented: The spectrum of glueballs and their decay rates into pions, and the phase diagram of QCD at finite temperature, density, and magnetic field strength.

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Holographic cold nuclear matter as dilute instanton gas

Cited by 29 publications

References 24 publications

Cool baryon and quark matter in holographic QCD

Cool baryon and quark matter in holographic QCD

Layers of deformed instantons in holographic baryonic matter

The Witten-Sakai-Sugimoto model: A brief review and some recent results

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