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Modification of the photon dispersion relation in chiral matter enables $1\to2$ scattering. As a result, the single fermion and photon states are unstableto photon radiation and pair production respectively. In particular, a fastfermion moving through chiral matter can spontaneously radiate a photon, whilea photon can spontaneously radiate a fast fermion and anti-fermion pair. Thecorresponding spectra are derived in the ultra-relativistic approximation. Itis shown that the polarization of the produced and decayed photons isdetermined by the sign of the chiral conductivity. Impact of a flat thin domainwall on the spectra is computed.

Radiative instability of quantum electrodynamics in chiral matter