Reheating and Entropy Perturbations in Fibre Inflation

Abstract

We study reheating in some one and two field realizations of {\it Fibre Inflation}. We find that reheating begins with a phase of preheating in which long wavelength fluctuation modes are excited. In two field models there is a danger that the parametric amplification of infrared fluctuations in the second scalar field - associated with an entropy mode - might induce an instability of the curvature fluctuations. We show that, at least in the models we consider, the entropy mode has a sufficiently large mass to prevent this instability. Hence, from the point of view of reheating the models we consider are well-behaved.

20 pages, 18 figures

References in corpus (4)

• Monodromy in the CMB: Gravity Waves and String Inflation
• Flux Compactification
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• A Study of Structure Formation and Reheating in the D3/D7 Brane Inflation Model

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• Phenomenological Consequences of the Refined Swampland Conjecture
• Reheating and Dark Radiation after Fibre Inflation
• Numerical study of inflationary preheating with arbitrary power-law potential and a realization of curvaton mechanism
• Fibre inflation and precision CMB data