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Solving the domain wall problem with first-order phase transition
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Domain wall networks are two-dimensional topological defects generally predicted in many beyond standard model physics. In this Letter, we propose to solve the domain wall problem with the first-order phase transition. We numerically study the phase transition dynamics, and for the first time show that the domain walls reached scaling regime can be diluted through the interaction with vacuum bubbles during the first-order phase transition. We find that the amplitude of the gravitational waves produced by the second-stage first-order phase transition is several orders higher than that from the domain walls evolution in the scaling regime. The scale of the first-order phase transition that dilute the domain walls can be probed through gravitational waves detection.
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Numerical simulations on First-order phase transition through thermal fluctuation
3+1D lattice simulations show that thermal fluctuations alone can nucleate vacuum bubbles through precursor oscillons, and the resulting gravitational wave spectrum scales with the mean bubble separation.
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