A simple, exact, model of quasi-single field inflation

Abstract

In this note we present a simple but exact model of quasi-single field inflation \cite{Chen:2009zp, Chen:2009we}, in which the couplings between perturbations are completely controlled, and for instance can be made constant with any desired value. This provides a way to numerically implement quasi-single field inflation and to test its predictions in various regimes. We confirm that the numerics agree to good accuracy with the analytical predictions for the isosceles bispectrum and the full shape function.

3 pages, 3 figures, comments welcome

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• Perturbative unitarity in quasi-single field inflation
• Dynamical consistency conditions for rapid turn inflation
• Possible Impact of non-Gaussianities on cosmological constraints in neutrino physics
• Dynamics of Inspiraling Dark Energy
• Origin of ultra-light fields during inflation and their suppressed non-Gaussianity
• The hand-made tail: Non-perturbative tails from multifield inflation
• On the importance of heavy fields in pseudo-scalar inflation