Compact star of holographic nuclear matter and GW170817

Abstract

We use a holographic model of quantum chromodynamics to extract the equation of state (EoS) for the cold nuclear matter of moderate baryon density. This model is based on the Sakai-Sugimoto model in the deconfined Witten's geometry with the additional point-like D4-brane instanton configuration as the holographic baryons. Our EoS takes the following doubly-polytropic form: = 2.629A −0.192 p 1.192 + 0.131A 0.544 p 0.456 with A a tunable parameter of order 10 −1 , where and p are the energy density and pressure, respectively. The sound speed satisfies the causality constraint and breaks the sound barrier. We solve the Tolman-Oppenheimer-Volkoff equations for the compact stars and obtain the reasonable compactness for the proper choices of A. Based on these configurations we further calculate the tidal deformability of the single and binary stars. We find our results agree with the inferred values of LIGO/Virgo data analysis for GW170817.

Holographic quarkyonic matter

“…For instance, one might ask whether quarkyonic matter exists in the interior of neutron stars or whether it might be created in a neutron star merger. This question can be JHEP09(2020)112 addressed by computing the equation of state and the resulting mass-radius relations and tidal deformability, as recently done within the same model, but without any form of quark matter [73], and in other holographic approaches [74][75][76][77][78]. We have pointed out that in the given approximation the zero-temperature transition to quarkyonic matter occurs at densities probably too large to be reached in neutron stars, although at nonzero temperatures the transition density becomes smaller and is possibly reached in a merger process.…”

Predictions for neutron stars from holographic nuclear matter

“…Beyond the shaded region at least one of the constraints is violated. As a consequence, for this particular value of the 't Hooft coupling, we obtain 2.11 M M max 2.40 M and new bounds for Λ 1.4 , R 1.4 , Λ 2.1 , R 2.1 , for instance 288 Λ 1.4 580.tion and see that indeed all known astrophysical constraints can be satisfied (in contrast to the simple pointlike approximation of baryons within the same holographic model[22,30]).…”

Quantum information probes of charge fractionalization in large-N gauge theories

“…AdS/CFT, or holography, is a framework that has become increasingly popular to understand complicated phenomena involving strongly coupled degrees of freedom in large-N gauge theories [1]. Its application to systems with a finite charge density range from neutron stars [2][3][4][5][6][7][8][9][10][11][12][13] to quantum Hall systems [14][15][16][17][18][19][20][21][22][23][24], superfluids and superconductors [25][26][27][28][29][30][31][32], strange metals [33][34][35][36][37][38][39][40][41], and more general quantum critical systems [42][43][44][45][46][47]. Many of these setups exhibit a rich phenomenology that resembles that of real-world (finite-N...…”

“…The proposed gravity dual for this quantity is given by the entanglement wedge cross section E W [65,66]. 6 The entanglement of purification is a correlation measure for mixed states. It is defined by…”