The five-dimensional topological axion electrodynamics is shown to possess a 3-crossed module structure through modified Stueckelberg couplings required for background gauge invariance.
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hep-th 3years
2026 3representative citing papers
Broken higher-group and non-invertible symmetries still act on the space of couplings, and their 'family anomalies' force the infrared theory to be gapless, spontaneously broken, or interrupted by a phase transition.
CMB polarization rotation can arise as a frequency-independent Pancharatnam phase when photons cross dark-sector vacuum interfaces, with no ultralight axion required.
citing papers explorer
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3-Crossed Module Structure in the Five-Dimensional Topological Axion Electrodynamics
The five-dimensional topological axion electrodynamics is shown to possess a 3-crossed module structure through modified Stueckelberg couplings required for background gauge invariance.
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Generalized Families of QFTs
Broken higher-group and non-invertible symmetries still act on the space of couplings, and their 'family anomalies' force the infrared theory to be gapless, spontaneously broken, or interrupted by a phase transition.
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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.