Explores the role of viscosity in redistributing angular momentum in astrophysical objects, focusing on accretion disks and energy conversion efficiency.
Explores the classification and statistics of AGN, black holes, unified AGN model, variability, megamasers, orbital motion measurement, and time-delay cosmography.
Explores dispersion relations, system responses to perturbations, and the stability of rotating systems, focusing on the origin of spiral structures in galaxies.
