Investigation of compact stars with heavy baryons and quarks: second period

Abstract

This project continued into the second stage, the exploration of compact stars with a focus on their properties at high-density matter that contains heavy baryons (hyperons and ∆-resonances) and quarks. The key idea was to extend the existing codes for heavy-baryon and quark matter and the computation of key thermodynamic quantities of such matter, including the equation of state and composition at non-zero temperature. These results were compared to the macroscopic properties of compact stars, such as mass, radius, moment of inertia, and deformability, to place constraints on the underlying models. We have also continued the studies of transport properties of dense matter, in particular, the bulk viscosity of nucleonic matter. The focus has been on the muon component in the matter in neutrino-transparent and trapped regimes. Rapidly and maximally rotating hot, rigidly rotating stars were computed as a first application of the obtained equation of state of hyperonic matter. Our nucleonic and hyperonic equations of state were exported to the CompOSE repository for the use of the numerical relativity community.