Nadav is a PhD student at the Tel-Aviv University School of Physics, and is currently a visiting graduate student at the Institute for Advanced Study, Princeton. His research is in theoretical high-energy physics, the field of physics that depicts the fundamental ingredients of the universe, the way they interact, and the forces operating on them. The vast majority of observed natural phenomena are very well explained by physical theories. Nevertheless, some discrepancies between them and the findings of various experiments have motivated theories and models whose validation requires experiments of greater precision. While significant effort is invested in testing these models in controlled experiments using detectors and particle accelerators, Nadav’s research takes an alternative approach, asking what these models would imply for our picture of the universe, galaxies and stars and how these implications could be revealed through astrophysical observation.