Towards general patterns of features in multi-field inflation

Abstract

We investigate the consequences of general curved trajectories in multi-field inflation. After setting up a completely general formalism using the mass basis, which naturally accommodates the notion of light and heavy modes, we study in detail the simple case of two successive turns in two-field system. We find the power spectrum of the curvature perturbation receives corrections that exhibit oscillatory features sinusoidal in the logarithm of the comoving wavenumber without slow-roll suppression. We show that this is because of the resonance of the heavy modes inside and outside the mass horizon.

(v1) 16 pages, 2 figures; (v2) 17 pages, minor updates, to appear in Journal of High Energy Physics

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• Consistency relations in multi-field inflation
• Consistency relations for sharp inflationary non-Gaussian features
• Correlated primordial spectra in effective theory of inflation
• A General Framework of Automorphic Inflation
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• Distinguishing cosmological models through quantum signatures of primordial perturbations
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