SO(10) GUT Models and Cosmology

Abstract

$SO(10)$ grand unified models have an intermediate symmetry group in between $SO(10)$ and $SU(3{)}_C\otimes SU(2{)}_L\otimes U(1{)}_Y$. Hence they lead to a prediction for proton lifetime in agreement with the experimental lower limit. This paper reviews the recent work on the tree-level potential and the one-loop effective potential for such models, with application to inflationary cosmology. The open problems are the use of the most general form of tree-level potential for $SO(10)$ models in the reheating stage of the early universe, and the analysis of non-local effects in the semiclassical field equations for such models in Friedmann-Robertson-Walker backgrounds.

7 pages, Latex, talk prepared for the Second International Sakharov Conference on Physics, Moscow (May 1996)