Model-independent dark energy differentiation with the integrated Sachs-Wolfe effect

被引：48

作者：

Corasaniti, PS ^{[1
]}

Bassett, BA

Ungarelli, C

Copeland, EJ

机构：

[1] Univ Sussex, Ctr Theoret Phys, Brighton BN1 9QJ, E Sussex, England

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

[3] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.90.091303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the integrated Sachs-Wolfe effect using a model-independent parametrization of the dark energy equation of state, w(z). Cosmic variance severely restricts the class of models distinguishable from one based on cold dark matter and a cosmological constant unless w(z) currently satisfies w(Q)(o)>-0.8, or exhibits a rapid, late-time, transition at redshifts z<3. Because of the degeneracy with other cosmological parameters, models with a slowly varying w(z) cannot be differentiated from each other or from a cosmological constant. This may place a fundamental limit on our understanding of the origin of the currently observed acceleration.

引用

页数：4

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