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Axion-like particles (ALPs) can be naturally lighter than the electroweakscale. We consider an ALP that couples to the Standard Model Higgs to achievethe strong first-order electroweak phase transition. We discuss the two-fielddynamics of the phase transition and the associated computation in detail andidentify the viable parameter space. The ALP mass can be from the MeV to GeVscale. Baryon asymmetry can be explained by local baryogenesis withoutviolating the electron electric dipole moment bound. The viable parameter spacecan be probed through Higgs exotic decay, rare kaon decay, the electronelectric dipole moment, and the effective number of neutrinos in the cosmicmicrowave background. The gravitational-wave signal is too weak to be detected.

ALP-Assisted Strong First-Order Electroweak Phase Transition and Baryogenesis