Three versions (soft, intermediate, and stiff variants) of the temperature and electron fraction dependent holographic V-QCD hybrid EOS model constructed in [DEJ_2022]. The high density part is based on a gauge/gravity duality calculation that describes the deconfinement phase transition from dense nuclear to quark matter within the V-QCD model, while the low density part uses a combination of the HS(DD2) [HSNP_2010, TRKBP_2010] and a small contribution of APR [ APRP_1998] around and below nuclear saturation density that is augmented by a gas of light mesons at high temperature. The reduction of the EOSs to beta equilibrium and zero temperature agrees with the three JJ(VQCD(APR)) EOSs (up to very minor adjustments) by construction. The model features a mixed nuclear and quark matter phase at finite temperature that ends on a critical point and is obtained by combining a van der Waals extension of V-QCD nuclear matter with V-QCD quark matter through a Gibbs construction. As additional data, we provide the quark fraction as well as the thermodynamic properties of pure nuclear and quark matter in the region of the mixed phase.
Nuclear Matter Properties
Neutron Star Properties
References to the original work:
- [HSNP_2010] M. Hempel and J. Schaffner-Bielich, Nucl. Phys. A 837, 210 (2010)
- [TRKBP_2010] S. Typel, G. Röpke, T. Klähn, D. Blaschke, and H.H. Wolter, Phys. Rev. C 81, 015803 (2010)
- [APRP_1998] A. Akmal, V. R. Pandharipande and D. G. Ravenhall, Phys. Rev. C 58, 1804 (1998)
- [DEJ_2022] T. Demircik, C. Ecker, and M. Jarvinen, arXiv:2112.12157 (2022)