Clustering Fossils from the Early Universe

被引：99

作者：

Jeong, Donghui ^{[1
]}

Kamionkowski, Marc ^{[1
,2
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21210 USA

[2] CALTECH, Pasadena, CA 91125 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 25期

关键词：

COSMOLOGY; GRAVITY; SDSS;

D O I：

10.1103/PhysRevLett.108.251301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Many inflationary theories introduce new scalar, vector, or tensor degrees of freedom that may then affect the generation of primordial density perturbations. Here we show how to search a galaxy (or 21-cm) survey for the imprint of primordial scalar, vector, and tensor fields. These new fields induce local departures to an otherwise statistically isotropic two-point correlation function, or equivalently, nontrivial four-point correlation functions (or trispectra, in Fourier space), that can be decomposed into scalar, vector, and tensor components. We write down the optimal estimators for these various components and show how the sensitivity to these modes depends on the galaxy-survey parameters. New probes of parity-violating early-Universe physics are also presented.

引用

页数：4

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