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.
Autori interni: | ||
Autori: | Melchiorri A; Polosa AD; Strumia A | |
Titolo: | New bounds on millicharged particles from cosmology | |
Anno del prodotto: | 2007 | |
Digital Object Identifier (DOI): | 10.1016/j.physletb.2007.05.042 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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