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2012
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X. Chen, “Primordial Features as Evidence for Inflation,” JCAP
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Then

R. Saito, M. Nakashima, Y. -i. Takamizu and J. ’i. Yokoyama, “Resonant Signatures of Heavy Scalar Fields in the Cosmic Microwave Background,” JCAP
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C. P. Burgess, M. W. Horbatsch and S. .P. Patil, “Inflating in a Trough: Single-Field Effective Theory from Multiple-Field Curved Valleys,” JHEP
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2013
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2013
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T. Kobayashi and J. ’i. Yokoyama, “Primordial Spikes from Wrapped Brane Inflation,” JCAP
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2013

Primordial spectra from sudden turning trajectory

Noumi, Toshifumi, Yamaguchi, Masahide

Understand

Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory.

When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations.
In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately.
We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn.