When can preheating affect the CMB?

Details When can preheating affect the CMB? When can preheating affect the CMB?

2002-04-02

arxiv.org/abs/astro-ph/0204031v1

Phys.Lett. B536 (2002) 9-17

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures

Scientific paper

10.1016/S0370-2693(02)01813-0

We discuss the principles governing the selection of inflationary models for which preheating can affect the CMB. This is a (fairly small) subset of those models which have non-negligible entropy/isocurvature perturbations on large scales during inflation. We study new models which belong to this class - two-field inflation with negative nonminimal coupling and hybrid/double/supernatural inflation models where the tachyonic growth of entropy perturbations can lead to the variation of the curvature perturbation, ${\cal R}$, on super-Hubble scales. Finally we present evidence against recent claims for the variation of ${\cal R}$ in the absence of substantial super-Hubble entropy perturbations.

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