A cosmological bound on the invisible axion
Abstract
The production of axions in the early universe is studied. Axion models which break the U(1)PQ symmetry above 1012 GeV are found to produce an unacceptably large axion energy density.
Supported in part by DOE contract DSR80136je7.- Publication:
-
Physics Letters B
- Pub Date:
- January 1983
- DOI:
- Bibcode:
- 1983PhLB..120..133A