Joint Astro/Nuclear Seminar by Armen Sedrakian on Multimessenger astrophysics of compact stars with exotic cores

Relativistic density functionals based on baryon-meson Lagrangians can be used to describe dense matter in compact stars including hyperonic and Delta-resonance degrees of freedom. These can be supplemented with a first-order phase transition to quark matter at high densities to describe hybrid compact stars. I will discuss how the mass-radius and tidal deformability inferences from electromagnetic and gravitational wave observations constrain the current models of hypernuclear and hybrid stars. I will briefly review recent results on the bulk viscosity of dense nucleonic matter in hot compact stars, which emerged in recent years as the leading dissipative channel in binary-neutron star merger simulations.

Sponsored by the McDonnell Center for the Space Sciences.