Holographic nuclear physics

Abstract

We analyze the phases of the Sakai-Sugimoto model at finite temperature and baryon chemical potential. Baryonic matter is represented either by 4-branes in the 8-branes or by strings stretched from the 8-branes to the horizon. We find the explicit configurations and use them to determine the phase diagram and equation of state of the model. The 4-brane configuration (nuclear matter) is always preferred to the string configuration (quark matter), and the latter is also unstable to density fluctuations. In the deconfined phase the phase diagram has three regions corresponding to the vacuum, quark-gluon plasma, and nuclear matter, with a first-order and a second-order phase transition separating the phases. We find that for a large baryon number density, and at low temperatures, the dominant phase has broken chiral symmetry. This is in qualitative agreement with studies of QCD at high density.

Mesons in gauge/gravity duals

“…In particular, there are unstable regions in the phase diagrams. Studies of finite chemical potential and finite density effects for D7 brane probes in the AdS-Schwarzschild background may be found in [101,[202][203][204][205][206][207][208][209][210].…”

A modulated shear to entropy ratio

“…Thus, the probe limit used in this work should be thought of as a toy model. It would be interesting to carry out the current analysis in a setting whose gravity dual is well defined, such as the Sakai-Sugimoto model [59][60][61][62], and then demonstrate a violation of the bound (1.1) in a fully controlled string-theoretical setting.…”

Rho meson condensation at finite isospin chemical potential in a holographic model for QCD

“…For an axial-like chemical potential 14 we have the following relations between the parameters of the field theory, µ A and L, and the parameters E and u 0 of the solutions found above:…”