Abstract
We consider the possibilities for generating a baryon asymmetry in the early universe in a flipped SU(5) × U(1) model inspired by the superstring. Depending on the temperature of the radiation background after inflation we can distinguish between two scenarios for baryogenesis: (1) after reheating the original SU(5) × U(1) symmetry is restored, or there was no inflation at all; (2) reheating after inflation is rather weak and SU(5) × U(1) is broken. In either case the asymmetry is generated by the out-of-equilibrium decays of a massive SU(3) × SU(2) × U(1) singlet field φm. In the flipped SU(5) × U(1) model, gauge symmetry breaking is triggered by strong coupling phenomena, and is in general accompanied by the production of entropy. We examine constraints on the reheating temperature and the strong coupling scale in each of the scenarios.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 483-488 |
| Number of pages | 6 |
| Journal | Physics Letters B |
| Volume | 200 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 21 1988 |
Bibliographical note
Funding Information:We would like to thankR . Parkerf or valuabled is-cussionsT. hework of DVN was supporteidn partb y DOE GrantN o. DE-AC02-76ER008a1n din partb y the Universityo f WisconsinR esearchC ommittee with funds grantedb y the WisconsinA lumni Re-searchF oundationT.h ework of KAO was supported in part by a PresidentiaYlo ung InvestigatoArw ard and in part by DOE Grant No. DE-AC02-83ER-40105.