MINIMALISM IN INFLATION MODEL-BUILDING

In this paper we demand that a successful inflationary scenario should follow from a model entirely motivated by particle physics considerat ions. We show that such a connection is indeed possible within the fra mework of concrete supersymmetric Grand Unified Theories where the dou blet-triplet splitting problem is naturally solved. The Fayet-Iliopoul os D-term of a gauge U(1)(xi) symmetry, which plays a crucial role in the solution of the doublet-triplet splitting problem, simultaneously provides a built-in inflationary slope protected from dangerous superg ravity corrections. (C) 1998 Published by Elsevier Science B.V.