Abstract
Cosmological evolution of axion field in the early universe might be significantly affected by a thermal friction induced by the axion coupling to thermalized hidden sector. We examine the effects of such a thermal friction on axion dark matter density and its perturbation when the thermal friction dominates over the Hubble friction until when the axion field begins to oscillate around the potential minimum. We show that in the presence of sizable thermal friction there can be an exponential decay phase of the axion field before the oscillation phase, during which the axion energy density is efficiently dissipated into hidden thermal bath. Consequently, the previously excluded parameter region due to overclosing relic axion density becomes cosmologically viable with thermal friction. In particular, a QCD axion much lighter than
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Choi, K., Im, S.H., Kim, H.J. et al. Axion dark matter with thermal friction. J. High Energ. Phys. 2023, 180 (2023). https://doi.org/10.1007/JHEP02(2023)180
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DOI: https://doi.org/10.1007/JHEP02(2023)180