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We investigate a cosmological model wherein a waterfall symmetry breakingoccurs during the radiation-dominated era. The model comprises a complexwaterfall field, an axion field, and the gauge field (dark photon) generatedthrough a tachyonic instability due to the Chern-Simons interaction. Prior tosymmetry breaking, the total energy density incorporates a vacuum energy fromthe waterfall field, establishing a novel scenario for Early Dark Energy (EDE).Subsequent to the symmetry breaking, the dark photon dynamically acquires massvia the Higgs mechanism, potentially contributing to the dark matter abundance.Hence, our model can simultaneously address the $H_0$ tension and the origin ofdark matter.

Early Dark Energy and Dark Photon Dark Matter from Waterfall Symmetry Breaking