Gauge-invariant temperature anisotropies and primordial non-Gaussianity

被引：84

作者：

Bartolo, N ^{[1
]}

Matarrese, S

Riotto, A

机构：

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

[2] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

[3] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.93.231301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We provide the gauge-invariant expression for large-scale cosmic microwave background temperature fluctuations at second-order perturbation theory. This enables us to define unambiguously the nonlinearity parameter f(NL), which is used by experimental collaborations to pin down the level of non-Gaussianity in the temperature fluctuations. Furthermore, it contains a primordial term encoding all the information about the non-Gaussianity generated at primordial epochs and about the mechanism which gave rise to cosmological perturbations, thus neatly disentangling the primordial contribution to non-Gaussianity from the one caused by the postinflationary evolution.

引用

页数：4

共 21 条

[11] Acoustic signatures in the primary microwave background bispectrum [J].