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.

arXiv comment3 pages, 3 figures, comments welcome

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• Cosmological Signatures of Superheavy Dark Matter
• Shift-Symmetric Orbital Inflation: single field or multi-field?
• Axion Isocurvature Collider
• Perturbative unitarity in quasi-single field inflation
• Dynamical consistency conditions for rapid turn inflation
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• The hand-made tail: Non-perturbative tails from multifield inflation
• On the importance of heavy fields in pseudo-scalar inflation