ar X iv : h ep - p h / 07 03 14 4 v 2 2 3 M ay 2 00 7 New bounds on millicharged particles from cosmology
نویسندگان
چکیده
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 −7 e (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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