PeV-scale leptogenesis, gravity waves and black holes from a SUSY-breaking phase transition

Understand

Supersymmetry is a highly motivated theoretical framework, whose scale of breaking may be at PeV energies, to explain null searches at the Large Hadron Collider.

• SUSY breaking through a first order phase transition may have occurred in the early universe, leading to potential gravitational wave signals.
• Constructing a realistic model for gauge-mediated supersymmetry breaking, we show that such a transition can also induce masses for heavy right-handed neutrinos and sneutrinos, whose CP-violating decays give leptogenesis at the PeV scale, and a novel mechanism of neutrino mass generation at one loop.
• For the same models we predict the possible gravity wave signals, and we study the possibility of production of primordial black holes during the phase transition.