A light spectator field first creates and later disables an extra axion potential, letting axion domain walls decay and matching dark matter at larger decay constants.
Assuming that the initial axion field is uniformly distributed, the number density of the axion is given by na ≃ 1 ℓ ℓX r=1 n(r) a
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Bias with a Timer: Axion Domain Wall Decay and Dark Matter
A light spectator field first creates and later disables an extra axion potential, letting axion domain walls decay and matching dark matter at larger decay constants.