Cool baryon and quark matter in holographic QCD

Self Cite

155

We use the holographic V-QCD models to analyse the physics of dense QCD and neutron stars. Accommodating lattice results for thermodynamics of QCD enables us to make generic predictions for the Equation of State (EoS) of the quark matter phase in the cold and dense regime. We demonstrate that the resulting pressure in V-QCD matches well with a family of neutron-star-matter EoSs that interpolate between state-of-the-art theoretical results for low and high density QCD. After implementing the astrophysical constraints, i.e., the largest known neutron star mass and the recent LIGO/Virgo results for the tidal deformability, we analyse the phase transition between the baryonic and quark matter phases. We find that the baryon density n B at the transition is at least 2.9 times the nuclear saturation density n s . The transition is of strongly first order at low and intermediate densities, i.e., for n B /n s 7.5.

Section: Discussionmentioning

confidence: 99%

Holographic QCD in the Veneziano limit and neutron stars

Jokela

Järvinen

Remes

2019

Self Cite

155

“…In ref. [31], another holographic bottomup approach, working in the so-called Veneziano limit, was employed to construct a phase where quarks and pointlike baryons coexist. It was argued, however, that this phase only exists in a version of the model that is unfavored otherwise.…”

Section: Jhep09(2020)112mentioning

confidence: 99%

Holographic quarkyonic matter

Kovensky

Schmitt

2020

We point out a new configuration in the Witten-Sakai-Sugimoto model, allowing baryons in the pointlike approximation to coexist with fundamental quarks. The resulting phase is a holographic realization of quarkyonic matter, which is predicted to occur in QCD at a large number of colors, and possibly plays a role in real-world QCD as well. We find that holographic quarkyonic matter is chirally symmetric and that, for large baryon chemical potentials, it is energetically preferred over pure nuclear matter and over pure quark matter. The zero-temperature transition from nuclear matter to the quarkyonic phase is of first order in the chiral limit and for a realistic pion mass. For pion masses far beyond the physical point we observe a quark-hadron continuity due to the presence of quarkyonic matter.

“…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%

“…matching the value corresponding to a conformal theory in 2d and not that of 3d. Notice that at finite chemical potential there are plenty of examples in holography where one can exceed the conformal value [67][68][69], as long as the conformal symmetry is broken. Here the mechanism is quite different and can be associated with the presence of the defect instead of some intrinsic energy scale.…”

Section: Stiffness At Zero Temperaturementioning

confidence: 99%

Holographic fundamental matter in multilayered media

Gran

Jokela

Musso

et al. 2019

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