Description
In this talk, I will explore how gravitational-wave (GW) signatures can
reveal the nature of neutrino masses—Dirac, Majorana, or pseudo-Dirac. Within
the minimal $B-L$ gauge extension of the Standard Model, I will show that
Majorana neutrinos with high-scale breaking produce flat GW spectra from cosmic
strings, Dirac neutrinos with low-scale breaking generate peaked spectra from
first-order phase transitions, and pseudo-Dirac scenarios lead to kink-like features
from domain wall annihilation.
