Measuring deviations from a cosmological constant: A field-space parametrization

被引：46

作者：

Crittenden, Robert ^{[1
]}

Majerotto, Elisabetta

Piazza, Federico

机构：

[1] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 2UP, Hants, England

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

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 25期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevLett.98.251301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Most parametrizations of the dark energy equation of state do not reflect realistic underlying physical models. Here we develop a relatively simple description of dark energy based on the dynamics of a scalar field which is exact in the limit that the equation of state approaches a cosmological constant, assuming some degree of smoothness of the potential. By introducing just two parameters defined in the configuration space of the field, we are able to reproduce a wide class of quintessence models. We examine the observational constraints on these models as compared to linear evolution models and show how priors in the field space translate into priors on observational parameters.

引用

页数：4

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