Cosmic jerk, snap and beyond

被引：90

作者：

Dunajski, Maciej ^{[1
]}

Gibbons, Gary ^{[1
]}

机构：

[1] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England

来源：

CLASSICAL AND QUANTUM GRAVITY | 2008年 / 25卷 / 23期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1088/0264-9381/25/23/235012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We clarify the procedure for expressing the Friedmann equation in terms of directly measurable cosmological scalars constructed out of higher derivatives of the scale factor. We carry out this procedure for pure dust, Chaplygin gas and generalized Chaplygin gas energy-momentum tensors. In each case it leads to a constraint on the scalars thus giving rise to a test of general relativity. We also discuss a formulation of the Friedmann equation as unparametrized geodesic motion and its connection with the Lagrangian treatment of perfect fluids coupled to gravity.

引用

页数：9

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