Abstract
If large extra dimensions exist in nature, supernova (SN) cores will emit large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these particles with energies and masses up to about 100 MeV. Radiative decays then give rise to a diffuse cosmic -ray background with which is well in excess of the observations if more than of the SN energy is emitted into the new channel. For two extra dimensions we derive a conservative bound on their radius of ; for three extra dimensions it is .
- Received 22 March 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.051301
©2001 American Physical Society