I will present a combination of three observational
techniques—astrometry, radial velocity, and direct imaging—to
discover, weigh, and characterize massive exoplanets and brown
dwarfs. Only a few exoplanets have both measured masses (from
radial...
Black hole perturbation theory captures a few important effects
in the dynamics of binary mergers, such as tidal deformations and
the decay of ringdown modes. It also describes the physics of the
photon ring. However, extracting qualitative results...
