Heavy Baryons in Compact Stars

Understand

We review the physics of hyperons and $\Delta$-resonances in dense matter in compact stars.

• The covariant density functional approach to the equation of state and composition of dense nuclear matter in the mean-field Hartree and Hartree-Fock approximation is presented, with regimes covering cold $\beta$-equilibrated matter, hot and dense matter with and without neutrinos relevant for the description of supernovas and binary neutron star mergers, as well as dilute expanding nuclear matter in collision experiments.
• We discuss the static properties of compact stars with hyperons and $\Delta$-resonances in light of constraints placed in recent years by the multimessenger astrophysics of compact stars on the compact stars' masses, radii, and tidal deformabilities.
• The effects of kaon condensation and strong magnetic fields on the composition of hypernuclear stars are also discussed.