Redshift drift in an inhomogeneous universe: averaging and the backreaction conjecture

被引:20
作者
Koksbang, S. M. [1 ]
Hannestad, S. [1 ]
机构
[1] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
关键词
redshift surveys; dark energy experiments; gravity; dark energy theory; DARK-ENERGY; COSMOLOGICAL REDSHIFT; GENERAL-RELATIVITY; TIME EVOLUTION; FLUIDS;
D O I
10.1088/1475-7516/2016/01/009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
An expression for the average redshift drift in a statistically homogeneous and isotropic dust universe is given. The expression takes the same form as the expression for the redshift drift in FLRW models. It is used for a proof-of-principle study of the effects of backreaction on redshift drift measurements by combining the expression with two-region models. The study shows that backreaction can lead to positive redshift drift at low redshifts, exemplifying that a positive redshift drift at low redshifts does not require dark energy. Moreover, the study illustrates that models without a dark energy component can have an average redshift drift observationally indistinguishable from that of the standard model according to the currently expected precision of ELT measurements. In an appendix, spherically symmetric solutions to Einstein's equations with inhomogeneous dark energy and matter are used to study deviations from the average redshift drift and effects of local voids.
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页数:24
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