We study the possibility of probing the dynamical inverse seesaw mechanism for the origin of light neutrino masses via the detection of stochastic gravitational waves (GW) in the low-frequency regime currently being probed by pulsar timing arrays. As the lepton number-violating term in inverse seesaw typically remains in the sub-MeV ballpark, its dynamical origin naturally brings the possibility of a low-scale first-order phase transition, which can be probed at low-frequency GW experiments. We also find interesting complementarity with heavy neutral lepton searches, as GW experiments remain sensitive to parameter space with small active-sterile mixing, which is out of reach for most particle physics experiments.
@article{arxiv.2605.27519,
title = {Probing Dynamical Inverse Seesaw with Low-frequency Gravitational Waves},
author = {Debasish Borah and Sounak Dutta and Partha Kumar Paul and Indrajit Saha and Narendra Sahu},
journal= {arXiv preprint arXiv:2605.27519},
year = {2026}
}