Theoretical High Energy Physics
Largely Particle Physics Phenomenology involving a mix of following issues:
Physics of neutrinos: Lightest and least interacting and yet most puzzling !
Supersymmetry: If fermions (bosons) have Bosonic (Fermionic) partners, it solves many big mysteries, albeit, not without introducing newer and grander ones!
Baryogenesis: Laws treat matter-antimatter symmetrically, yet there is no anti-matter. Why?
Flavor Physics: Why fermionic matter shows up in 6 different “flavors”, in “hierarchical”