Speaker
Dr
Grigor Alaverdyan
(Yerevan State University)
Description
We present a study of abrupt changes of a compact star composition, structure and observable characteristics due to the quark deconfinement phase transition. First, we investigate the properties of the isospin-asymmetric nuclear matter in the improved relativistic mean-field theory, including a scalar-isovector $\delta$-meson effective field. To describe the quark phase, we use the improved version of 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 the catastrophic changes of the parameters of the near-critical configuration of the compact star and compute the amount of the energy released by the corequake for both cases of the deconfinement phase transition scenarios, corresponding to the ordinary first-order phase transition (Maxwell scenario), and the phase transition with formation of the mixed quark-hadron phase (Glendenning scenario). The results will give an opportunity to clarify the observational differences between the two scenarios of the quark-deconfinement phase transition and formulate a specific test for checking the phase transition scenario taking place in reality.
Author
Dr
Grigor Alaverdyan
(Yerevan State University)
