Particles with millicharge q and sub-eV mass can be produced in photon–photon collisions, distorting the energy spectrum of the Cosmic Microwave Background. We derive the conservative bound q≲10−7e (as well as model-dependent bounds two orders of magnitude stronger), incompatible with proposed interpretations of the PVLAS anomaly based on millicharged production or on millicharged-mediated axion-like couplings.
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Melchiorri et al. (2007) studied this question.
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