New Constraints on a Light Spinless Particle Coupled to Photons
arXiv:hep-ph/9702275 · doi:10.1103/PhysRevD.55.7967
Abstract
We obtain new stringent constraints on a light spinless particle phi coupled only to photons at low energies, considering its effects on the extragalactic photon background, the blackbody spectrum of the CMBR and the cosmological abundance of deuterium.
7 pages, 1 postscript figure