Non-Gaussian Curvature Spikes from Chaotic Billiards in Inflation Preheating

被引：96

作者：

Bond, J. Richard ^{[1
]}

Frolov, Andrei V. ^{[2
]}

Huang, Zhiqi ^{[1
]}

Kofman, Lev ^{[1
]}

机构：

[1] Univ Toronto, CITA, Toronto, ON M5S 1A7, Canada

[2] Simon Fraser Univ, Dept Phys, Vancouver, BC V5A 1S6, Canada

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 07期

关键词：

PERTURBATIONS; UNIVERSE;

D O I：

10.1103/PhysRevLett.103.071301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new class of non-Gaussian curvature fluctuations zeta(pr)(x) equivalent to delta N(chi(i)) arises from the postinflation preheating behavior of a noninflaton field chi(i). Its billiardlike chaotic dynamics imprints regular log-spaced narrow spikes in the number of preheating e-folds Nd(chi(i)). We perform highly accurate lattice simulations of supersymmetry-inspired quartic inflaton and coupling potentials in a separate-universe approximation to compute N(chi(i)) as a function of the (nearly homogeneous) initial condition chi(i). The superhorizon modes of chi(i)(x) result in positive spiky excursions in zeta(pr) and hence negative gravitational potential fluctuations added to the usual sign-independent inflaton-induced perturbations, observably manifested in large cosmic structures and as (polarized) temperature cosmic microwave background cold spots.

引用

页数：4

共 17 条

[1]

BOND JR, 1996, HOUCH SESS 60

[2] Lattice calculation of non-Gaussian density perturbations from the massless preheating inflationary model [J].