We supplement a previous discussion of baryosynthesis in flipped SU(5)×U(1) GUTs by including (1) the large incoherent field energy density which is likely SU(5) is broken, and (2) the possibility of additional Higgs triplet fields suggested by four dimensional string model-building. We consider strong (weak) reheating scenarios in which the Universe is (is not) SU(5) symmetric after inflation. We find an adequate baryon asymmetry subsequent to strong reheating, whatever the number of Higgs triplets (although beware of possible difficulties with quasi-stable relic particles), whereas weak reheating requires at least two Higgs triplets.
Bibliographical noteFunding Information:
Young Investigator Award and m part by DOE No DE-AC02-83ER-40 105
We would like to thank L Connors, A Deans and R Parker for valuable discussions One of us (J E ) thanks the Lawrence Berkeley Laboratory for its kmd hospitality while this work was completed The work of DVN was supported m part by DOE Grant No DE-AC02-76ER0081 and m part by the University of Wlsconsm ResearchC ommittee with funds granted by the Wisconsin Alumni ResearchF oundation The work of KAO was supportedm part by a Presidential