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We explore the phenomenology of QCD axion and axion-like particle (ALP) darkmatter production via misalignment during inflationary reheating. Weinvestigate scenarios involving inflaton oscillating in a generic potential$\sim \phi^n$, considering inflaton decay and annihilation for reheating. Forlow reheating temperatures, the parameter space leading to the correct relicabundance can be enlarged beyond the standard case. Depending on the type ofinflaton-matter couplings and the value of $n$, we find that certain parts ofthe extended parameter space are already constrained by ADMX, CAPP, and MUSEexperiments. Future Haloscope experiments are expected to impose stringentconstraints. We highlight the potential to utilize axion experiments inconstraining the dynamics of reheating.

Constraining Axion and ALP Dark Matter from Misalignment during Reheating