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

TL;DR

This paper explores how a PeV-scale SUSY-breaking phase transition in the early universe could generate gravitational waves, heavy neutrino masses, leptogenesis, neutrino masses, and primordial black holes.

Contribution

It presents a realistic gauge-mediated SUSY-breaking model linking phase transition dynamics to leptogenesis, neutrino mass generation, gravitational waves, and black hole production.

Findings

Potential gravitational wave signals from the phase transition.

Heavy right-handed neutrino and sneutrino masses induced by the transition.

Possibility of primordial black hole formation during the phase transition.

Abstract

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.