Abstract
We study the CP domain walls and the consequent gravitational waves induced by the spontaneous breaking of the CP symmetry in the complex singlet extension to the Standard Model. We impose the constraints from the unitarity, stability and the global minimal of the vacuum solutions on the model parameter space. The CP domain wall profiles and tensions are obtained by numerically solving the relevant field equations. The explicit CP violation terms are then introduced to the potential as biased terms to make the domain walls unstable and collapse, The BBN bound on the magnitude of the energy bias is taken into account. To achieve sufficiently strong gravitational wave signals, the domain wall tension σ is required to be at least σ/TeV3 ∼ \( \mathcal{O} \)(103). We find that the gravitational wave spectrum can be probed in the future SKA and/or DECIGO programs, when the typical mass scale is at least ∼ \( \mathcal{O} \)(10) TeV and the explicit CP violation terms are as small as \( \mathcal{O} \)(10−24)− \( \mathcal{O} \)(10−23). The gravitational waves from collapsing domain walls thus provide a complementarity to the probe of extremely small CP violation at high-energy scale.
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Chen, N., Li, T. & Wu, Y. The gravitational waves from the collapsing domain walls in the complex singlet model. J. High Energ. Phys. 2020, 117 (2020). https://doi.org/10.1007/JHEP08(2020)117
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DOI: https://doi.org/10.1007/JHEP08(2020)117