摘要
We study reheating in some one and two field realizations of 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.
We study reheating in some one and two field realizations of 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.
作者
Bao-Min Gu
Robert Brandenberger
古宝珉;Robert Brandenberger(Department of Physics,Nanchang University,Nanchang 330031,China;Center for Relativistic Astrophysics and High Energy Physics,Nanchang University,Nanchang 330031,China;Department of Physics,McGill University,Montr′eal,QC,H3A 2T8,Canada)
基金
supported by a scholarship granted by the China Scholarship Council(CSC,201706180072)
supported in part by funds from NSERC and from the Canada Research Chairs program
