Isocurvature perturbations during two-field inflation and reheating

被引：2
|
作者：
Abedi, Habib [1 ]
Abbassi, Amir M. [1 ]
机构：
[1] Univ Tehran, Dept Phys, North Kargar Ave, Tehran 1439955961, Iran
来源：
GENERAL RELATIVITY AND GRAVITATION | 2019年 / 51卷 / 02期
关键词：
Cosmological perturbation theory; Inflation; Physics of the early universe; SUPERMEMBRANES;
D O I：
10.1007/s10714-019-2515-4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use Hamilton-Jacobi formalism to study the curvature and isocurvature perturbations during inflation. This formalism is suitable for going beyond slow roll regime. We solve the equation of fields' perturbations for some two-field models, and calculate their spectra. We next use N formalism to calculate the curvature and isocurvature non-Gaussianity for a non-separable form of the Hubble expansion rate. Finally, using the sudden decay approximation, we obtain the link between the perturbations during inflation and after reheating for noninteracting fields.
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页数：32
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