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 less than or similar to 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. (c) 2007 Elsevier B.V. All rights reserved.
New bounds on millicharged particles from cosmology
STRUMIA, ALESSANDRO
2007-01-01
Abstract
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 less than or similar to 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. (c) 2007 Elsevier B.V. All rights reserved.File in questo prodotto:
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