Covariant evolution of perturbations during reheating in two-field inflation

被引：4

作者：

Gonzalez, Pablo ^{[1
,2
]}

Palma, Gonzalo A. ^{[2
]}

Videla, Nelson ^{[2
,3
]}

机构：

[1] Univ Tarapaca, Sede Esmeralda, Avda Luis Emilio Recabarren 2477, Iquique, Chile

[2] Univ Chile, FCFM, Dept Fis, Grp Cosmol & Astrofis Teor, Blanco Encalada 2008, Santiago, Chile

[3] Pontificia Univ Catolica Valparaso, Inst Fis, Avda Univ 330, Valparaiso, Chile

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 12期

关键词：

cosmological perturbation theory; inflation; physics of the early universe; DENSITY PERTURBATIONS; UNIVERSE SCENARIO; PHASE-TRANSITION; FLUCTUATIONS; FLATNESS; FORMULA; HORIZON; MODELS;

D O I：

10.1088/1475-7516/2018/12/001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We develop a covariant method for studying the effects of a reheating phase on the primordial adiabatic and isocurvature perturbations in two-field models of inflation. To model the decay of the scalar fields into radiation at the end of inflation, we introduce a prescription in which radiation is treated as an additional effective scalar field, requiring us to extend the two-field setup into a three-field system. In this prescription, the coupling between radiation and the scalars can be interpreted covariantly in terms geometrical quantities that parametrize the evolution of a background trajectory in a three-field space. In order to obtain concrete results, we consider two scenarios characterized for having unsuppressed isocurvature fluctuations at the end of inflation: (1) canonical two-field inflation with the product exponential potential, which sources a large negative amount of non-gaussianity and, (2) two-field inflation with an ultra-light field, a model in which the isocurvature mode becomes approximately massless, and its interaction with the curvature perturbation persists during the entire period of inflation. In both cases we discuss how their predictions are modified by the coupling of the scalar fields to the radiation fluid.

引用

页数：57

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