The curvature perturbation at second order

被引：23

作者：

Dias, Mafalda ^{[1
]}

Elliston, Joseph ^{[1
]}

Frazer, Jonathan ^{[2
,3
]}

Mulryne, David ^{[4
]}

Seery, David ^{[1
]}

机构：

[1] Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[2] Univ Basque Country, UPV EHU, Dept Theoret Phys, Bilbao 48040, Spain

[3] Ikerbasque, Basque Fdn Sci, E-48011 Bilbao, Spain

[4] Queen Mary Univ London, Astron Unit, London E1 4NS, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 02期

基金：

英国科学技术设施理事会; 欧洲研究理事会;

关键词：

inflation; cosmological perturbation theory; DENSITY PERTURBATIONS; INFLATIONARY UNIVERSE;

D O I：

10.1088/1475-7516/2015/02/040

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We give an explicit relation, up to second-order terms, between scalar-field fluctuations defined on spatially-flat slices and the curvature perturbation on uniform-density slices. This expression is a necessary ingredient for calculating observable quantities at second-order and beyond in multiple-field inflation. We show that traditional cosmological perturbation theory and the 'separate universe' approach yield equivalent expressions for superhorizon wavenumbers, and in particular that all nonlocal terms can be eliminated from the perturbation-theory expressions.

引用

页数：17

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