Theoretical modeling and numerical simulations of supernovae and remnants,
gamma-ray bursts, gravitational radiation from supernovae and colliding
black holes, accretion onto compact objects, and planetary nebulae; shock
waves, particle acceleration, and cosmic rays; neutrinos and nucleosynthesis
in supernovae and gamma-ray bursts. Radio, infrared, optical, and x-ray
observations of supernova remnants, pulsar-wind nebulae, and planetary nebulae.