View : 15 Download: 3

Measuring the speed of dark: Detecting dark energy perturbations

Title
Measuring the speed of dark: Detecting dark energy perturbations
Authors
De Putter R.Huterer D.Linder E.V.
Ewha Authors
Eric V. Linder
Issue Date
2010
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 81, no. 10
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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)≠ -1], degrees of freedom distinct from quintessence (cs≠ 1), and early presence of dark energy [Ωde(a≠1)≠ 0]. Future data may open a new window on dark energy by measuring its spatial as well as time variation. © 2010 The American Physical Society.
DOI
10.1103/PhysRevD.81.103513
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
Measuring the speed of dark Detecting dark energy perturbations.pdf(1.13 MB)Download
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE