Abstract
Ellis and Steigman have shown that in theSU(5) grand unified theory (GUT) the thermal history of the very early universe is trivial,i.e. in thermal equilibrium. Ogino pointed out that if torsion particles were introduced in theSU(5) GUT, the thermal history of the very early universe would become complex. As we know, one of more realistic grand unified models is theSU(11) family unified model suggested by Georgi. In this paper, we discuss the thermal history of the very early universe in the frame of Georgi’sSU(11) model. Because a lot of superheavy fermions will appear in theSU(11) model, Ogino’s results must be modified. These quantitative modifications have been calculated in this paper.
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