Measuring the Speed of Dark: Detecting Dark Energy Perturbations

Details Measuring the Speed of Dark: Detecting Dark Energy Perturbations Measuring the Speed of Dark: Detecting Dark Energy Perturbations

2010-02-08

arxiv.org/abs/1002.1311v1

Phys.Rev.D81:103513,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 11 figures

Scientific paper

10.1103/PhysRevD.81.103513

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 CMB 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)\ne-1), degrees of freedom distinct from quintessence (c_s\ne1), and early presence of dark energy (Omega_ de(a<<1)\ne0). Future data may open a new window on dark energy by measuring its spatial as well as time variation.

Affiliated with

Also associated with

No associations

Rating

Measuring the Speed of Dark: Detecting Dark Energy Perturbations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Measuring the Speed of Dark: Detecting Dark Energy Perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring the Speed of Dark: Detecting Dark Energy Perturbations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-123693