Abstract
We predict the presence of a spectral feature in the isotropic cosmic gamma-ray background associated with gravitino decays at high red shifts. With a gravitino abundance that falls in the relatively narrow range expected for thermally regenerated gravitinos following an inflationary epoch in the very early universe, gravitinos of mass several gigaelectronvolts are found to yield an appreciable flux of 110-MeV diffuse gamma rays.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2362-2365 |
| Number of pages | 4 |
| Journal | Physical review letters |
| Volume | 55 |
| Issue number | 21 |
| DOIs | |
| State | Published - 1985 |