Axion domain walls become transparent to low-energy photons at E/N=8/3 because of axion-pion cancellation, making thermal friction scale as T^8 rather than e^{-ma/T}.
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Monodromic transparency of axion domain walls
Axion domain walls become transparent to low-energy photons at E/N=8/3 because of axion-pion cancellation, making thermal friction scale as T^8 rather than e^{-ma/T}.