Finite-width axion domain walls generically support a localized normalizable chiral electromagnetic mode with linear gapless dispersion arising from helicity-dependent coupling to the axion gradient.
Monodromic transparency of axion domain walls
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CMB polarization rotation can arise as a frequency-independent Pancharatnam phase when photons cross dark-sector vacuum interfaces, with no ultralight axion required.
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Localization of Chiral Electromagnetic Waves on Thick Axion Domain Walls
Finite-width axion domain walls generically support a localized normalizable chiral electromagnetic mode with linear gapless dispersion arising from helicity-dependent coupling to the axion gradient.
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CMB Birefringence from Vacuum Interfaces
CMB polarization rotation can arise as a frequency-independent Pancharatnam phase when photons cross dark-sector vacuum interfaces, with no ultralight axion required.