Multi-field CP-violating phase transitions in a hidden NJL sector produce undetectable stochastic gravitational waves but remain cosmologically viable due to prompt domain wall collapse.
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High-quality axion models with N_DW=1 and dark matter abundance requirement restrict the gauge breaking scale to 1.6e11-1e16 GeV, yielding a band of gravitational wave signals from two-step phase transitions consistent with current observations.
citing papers explorer
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CP-violating multi-field phase transitions and gravitational waves in a hidden NJL sector
Multi-field CP-violating phase transitions in a hidden NJL sector produce undetectable stochastic gravitational waves but remain cosmologically viable due to prompt domain wall collapse.
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Probing High-Quality Axions with Gravitational Waves
High-quality axion models with N_DW=1 and dark matter abundance requirement restrict the gauge breaking scale to 1.6e11-1e16 GeV, yielding a band of gravitational wave signals from two-step phase transitions consistent with current observations.