Bimetric structure formation: Non-Gaussian predictions

被引：27

作者：

Magueijo, Joao ^{[1
]}

Noller, Johannes ^{[1
]}

Piazza, Federico ^{[2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England

[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

来源：

PHYSICAL REVIEW D | 2010年 / 82卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PRE-BIG-BANG; INFLATIONARY UNIVERSE; PERTURBATIONS; FLATNESS; SCENARIO; HORIZON; MODEL;

D O I：

10.1103/PhysRevD.82.043521

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The minimal bimetric theory employing a disformal transformation between matter and gravity metrics is known to produce exactly scale-invariant fluctuations. It has a purely equilateral non-Gaussian signal, with an amplitude smaller than that of Dirac Born Infeld inflation (with opposite sign) but larger than standard inflation. We consider nonminimal bimetric models, where the coupling B appearing in the disformal transformation (g) over cap (mu nu) = g(mu nu) - B partial derivative(mu)phi partial derivative(nu)phi can run with phi. For power-law B(phi) these models predict tilted spectra. For each value of the spectral index, a distinctive distortion to the equilateral property can be found. The constraint between this distortion and the spectral index can be seen as a "consistency relation" for nonminimal bimetric models.

引用

页数：9