2013-01-28

Speaker: Jonathan White (Kyoto University)

Title: Curvature perturbation in multi-field inflation with non-minimal coupling

Abstract: We consider the curvature perturbation resulting from multi-field inflation models
in which potentially all fields are non-minimally coupled to the Ricci Scalar.
We confirm that, unlike in the single field case, the curvature perturbations
associated with the Jordan and Einstein frames are not the same, and that
the difference is a direct consequence of the isocurvature perturbations
inherent to multi-field models. Using the dN formalism, and focusing on
analytically soluble examples, we see how the statistical properties of the two
curvature perturbations are also not necessarily the same, but confirm that
equivalence is recovered in the adiabatic limit.