New bounds on millicharged particles from cosmology

Details New bounds on millicharged particles from cosmology New bounds on millicharged particles from cosmology

2007-03-14

arxiv.org/abs/hep-ph/0703144v2

Phys.Lett.B650:416-420,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 2 figures. Final version

Scientific paper

10.1016/j.physletb.2007.05.042

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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