Analytical study of mode coupling in hybrid inflation

作者：Levasseur Laurence Perreault^*; Laporte Guillaume; Brandenberger Robert

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 82(12): 123524.

DOI：10.1103/PhysRevD.82.123524

We provide an analytical study of the coupling of short and long wavelength fluctuation modes during the initial phase of reheating in two field models like hybrid inflation. In these models, there is-at linear order in perturbation theory-an instability in the entropy modes of cosmological perturbations which, if not cut off, could lead to curvature fluctuations which exceed the current observational values. Here, we demonstrate that the backreaction of short wavelength fluctuations is too weak to lead to a truncation of the instability for the long wavelength modes on time scales comparable to the typical instability time scale of the long wavelength entropy modes. Hence, unless there are other mechanisms which truncate the instability, then in models such as hybrid inflation the curvature perturbations produced during reheating on scales of current observational interest may be very important.

• 出版日期2010-12-22