Resonant particle production during inflation: a full analytical study

被引：13

作者：

Pearce, Lauren ^{[1
,2
]}

Peloso, Marco ^{[1
,3
]}

Sorbo, Lorenzo ^{[4
]}

机构：

[1] Univ Minnesota, Sch Phys & Astron, 116 Church St SE, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Sch Phys & Astron, Fine Theoret Phys Inst, 116 Church St SE, Minneapolis, MN 55455 USA

[3] Univ Minnesota, Minnesota Inst Astrophys, 116 Church St SE, Minneapolis, MN 55455 USA

[4] Univ Massachusetts, Dept Phys, Amherst Ctr Fundamental Interact, 1126 Lederle Grad Res Tower LGRT, Amherst, MA 01003 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2017年 / 05期

基金：

美国国家科学基金会;

关键词：

inflation; non-gaussianity; PRIMORDIAL POWER SPECTRUM; WARM; FEATURES; MODEL;

D O I：

10.1088/1475-7516/2017/05/054

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We revisit the study of the phenomenology associated to a burst of particle production of a field whose mass is controlled by the inflaton field and vanishes at one given instance during inflation. This generates a bump in the correlators of the primordial scalar curvature. We provide a unified formalism to compute various effects that have been obtained in the literature and confirm that the dominant effects are due to the rescattering of the produced particles on the inflaton condensate. We improve over existing results (based on numerical fits) by providing exact analytic expressions for the shape and height of the bump, both in the power spectrum and the equilateral bispectrum. We then study the regime of validity of the perturbative computations of this signature. Finally, we extend these computations to the case of a burst of particle production in a sector coupled only gravitationally to the inflaton.

引用

页数：34

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