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2015

Towards general patterns of features in multi-field inflation

Gao, Xian, Gong, Jinn-Ouk

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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.

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