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Parametric resonance of entropy perturbations in massless preheating
https://doi.org/10.1142/S0218271815500820Cited by:12 (Source: Crossref)
Abstract
In this paper, we revisit the question of possible preheating of entropy modes in a two-field model with a massless inflaton coupled to a matter scalar field. Using a perturbative approximation to the covariant method we demonstrate that there is indeed a parametric instability of the entropy mode which then at second-order leads to exponential growth of the curvature fluctuation on super-Hubble scale. Back-reaction effects shut off the induced curvature fluctuations, but possibly not early enough to prevent phenomenological problems. This confirms previous results obtained using different methods and resolves a controversy in the literature.
Keywords:
PACS: 98.80.Cq
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