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This paper provides a systematic study of supergravity contributions relevantfor inflationary model building in Jordan frame supergravity. In thisframework, canonical kinetic terms in the Jordan frame result in the separationof the Jordan frame scalar potential into a tree-level term and a supergravitycontribution, which is potentially dangerous for sustaining inflation. We showthat if the vacuum energy necessary for driving inflation originates dominantlyfrom the F-term of an auxiliary field (i.e. not the inflaton), the supergravitycorrections to the Jordan frame scalar potential are generically suppressed.Moreover, these supergravity contributions identically vanish if thesuperpotential $W$ vanishes along the inflationary trajectory. On the otherhand, if the F-term associated with the inflaton dominates the vacuum energy,the supergravity contributions are generically comparable to the globallysupersymmetric contributions. In addition, the non-minimal coupling to gravityinherent to Jordan frame supergravity significantly impacts the inflationarymodel depending on the size and sign of this coupling. We discuss thephenomenology of some representative inflationary models, and point out therelation to the recently much discussed cosmological `attractor' models.

Supergravity Contributions to Inflation in models with non-minimal coupling to gravity