Reheating and entropy perturbations in fibre inflation

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 136-148
• 页数: 13页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/1/015103

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.