A dark SU(2) gauge sector that explains vector dark matter can produce LISA-detectable gravitational waves from a first-order phase transition, with a companion six-top signature at the HL-LHC.
Gravitational echoes of lepton number symmetry breaking with light and ultralight Majorons
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abstract
We formulate a version of the low-scale Majoron model equipped with an inverse seesaw mechanism featuring lepton-number preserving dimension-6 operators in the scalar potential. Contrary to its dimension-4 counterpart, we find that the model can simultaneously provide light and ultralight Majorons, neutrino masses and their mixing, while featuring strong first-order cosmological phase transitions associated to the spontaneous breaking of the lepton number and the electroweak symmetries in the early Universe. We show by a detailed numerical analysis that under certain conditions on the parameter space accounted for in collider physics, the model can be probed via the primordial gravitational wave spectrum potentially observable at LISA and other planned facilities.
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Gravitational Waves from Dark Gauge Sectors
A dark SU(2) gauge sector that explains vector dark matter can produce LISA-detectable gravitational waves from a first-order phase transition, with a companion six-top signature at the HL-LHC.