October 19, 2026: Dr. Yong Gao
Affiliation: Albert Einstein Institute (AEI), Potsdam, Germany
Title: Relativistic dynamical tides and postmerger hydrodynamical instabilities in neutron stars
Abstract: I will discuss relativistic dynamical tides during neutron-star inspiral and hydrodynamical instabilities in massive postmerger remnants. During inspiral, I will present a relativistic framework for dynamical tides based on the Mano–Suzuki–Takasugi analytical solutions of the exterior perturbation equation. By matching the stellar perturbations to the exterior solution, we extract the dynamical tidal response and incorporate it into effective-one-body evolution to study tidal resonances, gravitational-wave phase shifts, and crustal strain. I will then turn to massive postmerger remnants, presenting an analysis of local hydrodynamical instabilities, such as convective instability, and their possible connection to gravitational-wave features, followed by ongoing work on the Chandrasekhar–Friedman–Schutz instability in massive, differentially rotating neutron stars.