Mapping the dark energy with varying alpha

被引：64

作者：

Parkinson, D ^{[1
]}

Bassett, BA

Barrow, JD

机构：

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

[2] Univ Cambridge, Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England

来源：

PHYSICS LETTERS B | 2004年 / 578卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2003.10.081

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cosmological dark energy is a natural source of variation of the fine structure constant. Using a model-independent approach we show that once general assumptions about the alpha-varying interactions are made, astronomical probes of its variation constrain the dark-energy equation of state today to satisfy -1 < w(f) < -0.96 at 3-sigma and significantly disfavour late-time changes in the equation of state. We show how dark-energy-induced spatial perturbations of alpha are linked to violations of the equivalence principle and are thus negligible at low-redshift, in stark contrast to the BSBM theories. This provides a new test of dark energy as the source of alpha variation. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：235 / 240

页数：6

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