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The dynamical generation of right-handed-neutrino (RHN) masses in the earlyUniverse naturally entails the formation of cosmic strings that give rise to anobservable signal in gravitational waves (GWs). Here, we show that acharacteristic break in the GW spectrum would provide evidence for a new stagein the cosmological expansion history and a suppression of the RHN mass scalecompared to the scale of spontaneous symmetry breaking. The detection of such aspectral feature would thus represent a novel and unique possibility to probethe physics of RHN mass generation in regions of parameter space that allow forlow-scale leptogenesis in accord with electroweak naturalness.

Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum