Abstract
We obtain new stringent constraints on a light spinless particle φ coupled only to photons at low energies, considering its effects on the extragalactic photon background, the black-body spectrum of the cosmic microwave background radiation and the cosmological abundance of deuterium.
| Original language | English |
|---|---|
| Pages (from-to) | 7967-7969 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 55 |
| Issue number | 12 |
| Publication status | Published - 15 Jun 1997 |