2019 Physics/Theoretical Colloquium Thursday, October 24th , 2019 3:45 – 4:45 p.m. Rosen Auditorium (TA-53, Bldg. 001) Refreshments at 3:15pm Speaker: Dr. Christopher Fryer CCS-2: COMPUTATIONAL PHYSICS AND METHODS Los Alamos National Laboratory “Leveraging LANL: Using LANL's broad computational and physics (both theory and experiment) to study astrophysical” Abstract: Astrophysical transients are, by nature, multi-physics phenomena. To understand them, we must not only be able to gain insight from a broad astrophysical community (remnants, compact objects, binary stars and stellar astrophysics, supernovae, gamma-ray bursts, ...) but also leverage a broad range of physics and computational expertise (radiation transport, hydrodynamics and magnetohydrodynamics, plasma physics, dense nuclear matter, neutrino physics, nuclear cross-sections and nuclear physics, atomic physics). Our transient astrophysics team has leveraged the broad physics expertise at LANL to better understand these phenomena. I will review our current efforts to study the emission from neutron star mergers, reviewing how the ties to this broad LANL community have made our effort one of the leading transient teams in the country. In an era of multi-messenger astronomy, multi-physics and multi-disciplinary efforts are key, and LANL is well-poised to lead this challenge.