Dr. Gilad Sadeh

My research focuses on the physics of relativistic outflows, including the jets, ejecta, and blast waves produced during the formation of neutron stars and black holes, as well as in mergers involving neutron stars, and on the transient electromagnetic emission they generate. A central part of my work concerns the fundamental theory of relativistic blast waves: their self-similar evolution, causal structure, and the physical mechanisms that determine which solutions emerge dynamically. I investigate these questions through a combination of theoretical analysis and high-resolution numerical simulations. In parallel, I develop analytic and semi-analytic models of the dynamics and radiation of relativistic and mildly relativistic outflows, benchmark them against detailed numerical calculations, and use them to infer the properties of the ejecta and central engine from observations of gamma-ray bursts, kilonovae, and broadband afterglows, with particular emphasis on multimessenger events such as GW170817. More broadly, I am interested in compact-binary populations, particularly their merger rates and the constraints placed on them by the Galactic binary-pulsar population and the observed rate of short gamma-ray bursts.