Abstract
If couples to the Standard Model sector via Higgs portal, an axion-like particle (ALP) can drive a strong first-order phase transition insensitively to its decay constant. Such an ALP thus provides a simple and natural framework for electroweak baryogenesis, where the connection between electroweak symmetry breaking and baryogenesis is probed not by electric dipole moment or collider experiments but by ALP searches. The ALP can also delay the phase transition much below the weak scale, leading to late time entropy production.
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