Symmetry (Mar 2019)

Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

  • Ignacio Francisco Ranea-Sandoval,
  • Milva Gabriela Orsaria,
  • Germán Malfatti,
  • Daniela Curin,
  • Mauro Mariani,
  • Gustavo Aníbal Contrera,
  • Octavio Miguel Guilera

DOI
https://doi.org/10.3390/sym11030425
Journal volume & issue
Vol. 11, no. 3
p. 425

Abstract

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We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of the local and non-local versions of Nambu-Jona-Lasinio model for quark matter and the modern GM1(L) parametrization of the non-linear relativistic mean field model for hadronic matter. We compare our models with data from PSR J1614-2230 and PSR J0343+0432 and also from GW170817 and its electromagnetic counterpart GRB170817A and AT2017gfo. We study observational signatures of the appearance of a mixed phase as a result of modeling a phase transition that mimics the Gibbs formalism and compare the results with the sharp first-order phase transition obtained using the Maxwell construction. We also study in detail the g-mode associated with discontinuities in the equation of state, and calculate non-radial oscillation modes using relativistic Cowling approximation.

Keywords