To understand the physics of coalescing compact objects and make quantitative predictions about their properties (such as their equation of state (EOS), type of remnants, and gravitational waves (GWs) and electromagnetic (EM) signatures) sophisticated numerical modeling of the entire merger process is required. Such a consistent treatment must take into account the details of microphysical processes, and obtain the full solution of the Einstein field equations that describe a dynamical spacetime coupled to the relativistic magnetohydrodynamic and transport equations for neutrinos and electromagnetic radiation.
Here is a summary of a few of my current projects tackling these topics, some of which are long-standing problems in Theoretical Astrophysics and Numerical Relativity:
Remnants of neutron star-black hole binary mergers can be progenitors of central engines that power some sGRBs and aLIGO/Virgo/KAGRA's prime target.
These systems can be sources of GWs coincident with EM counterpart emission across the spectrum as demonstrated by the observation of GW170817.
Accreting black holes are central in explaining a range of high-energy astrophysical phenomena, such as X-ray binaries, active galactic nuclei, and quasars. They are LISA/DECIGO's prime target.
Next generation of ground-based interferometers, along with space-based observatories may observe an entirely new types of compact objects, which may provide stringent tests of General Relativity.