Measuring the speed of dark: Detecting dark energy perturbations

被引：94

作者：

de Putter, Roland ^{[1
,2
]}

Huterer, Dragan ^{[3
]}

Linder, Eric V. ^{[1
,2
,4
]}

机构：

[1] Univ Calif Berkeley, Berkeley, CA 94720 USA

[2] Berkeley Lab, Berkeley, CA 94720 USA

[3] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[4] Ewha Womans Univ, Inst Early Universe, Seoul, South Korea

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 10期

基金：

美国国家科学基金会;

关键词：

MICROWAVE BACKGROUND ANISOTROPIES; PROBE OBSERVATIONS; CROSS-CORRELATION; SOUND SPEED; CONSTRAINTS; GROWTH;

D O I：

10.1103/PhysRevD.81.103513

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The nature of dark energy can be probed not only through its equation of state but also through its microphysics, characterized by the sound speed of perturbations to the dark energy density and pressure. As the sound speed drops below the speed of light, dark energy inhomogeneities increase, affecting both cosmic microwave background and matter power spectra. We show that current data can put no significant constraints on the value of the sound speed when dark energy is purely a recent phenomenon, but can begin to show more interesting results for early dark energy models. For example, the best fit model for current data has a slight preference for dynamics [w(a)not equal -1], degrees of freedom distinct from quintessence (c(s) not equal 1), and early presence of dark energy [Omega(de)(a << 1) not equal 0]. Future data may open a new window on dark energy by measuring its spatial as well as time variation.

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