Confronting Dark Energy Anisotropic Stress

Abstract

We use the currently available cosmic observations to probe and constrain an imperfect dark energy fluid which is characterized by a constant equation of state $w$ and a constant speed of viscosity $c_{vis}^2$. The model parameter space was scanned by using Markov chain Monte Carlo method. The results show that the speed of viscosity $c_{vis}^2$ was not well constrained when currently available date sets, which include the cosmic microwave background radiation from {\it Planck}2013, type Ia supernovae and baryon acoustic oscillations, are used. But the cosmic data sets favor phantom dark energy with a negative speed of viscosity $c_{vis}^2$ slightly.

arXiv comment5 pages, 2 figures, code bugs removed, references added, CAMB code modification was described briefly

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Cited by in corpus (7)

• Large-scale Stability and Astronomical Constraints for Coupled Dark-Energy Models
• Effects of Anisotropic Stress in Interacting Dark Matter - Dark Energy Scenarios
• On the current status of Modified Gravity
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