Influence of phase-transition scenarios on the abrupt changes in the characteristics of compact stars

[摘要] We study the abrupt changes in the characteristics of compact stars due to the quark deconfinement phase transition. The hadronic phase is described within the relativistic mean-field theory, including a scalar-isovector δ-meson effective field. To describe the quark phase, we use the MIT bag model, in which the interactions between u, d and s quarks inside the bag are taken into account in the one-gluon exchange approximation. We analyze catastrophic changes of the parameters of the near-critical configuration of compact star and compute the amount of the energy released by a corequake for the two extreme cases of the deconfinement phase transition scenarios. The first one corresponds to the ordinary first-order phase transition (Maxwell scenario) and the second one corresponds to the phase transition calculated using the bulk Gibbs equilibrium conditions and global charge neutrality (Glendenning scenario).

[发布机构] Yerevan State University, Alex Manoogyan str. 1, Yerevan, Armenia^1

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Charge neutrality;Critical configurations;Effective field;First-order phase transitions;Gibbs equilibrium;One gluon exchanges;Relativistic mean-field theories;Transition scenarios