Probing Dynamics of Dark Energy with Supernova, Galaxy Clustering and the Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations

Abstract

Using the Markov chain Monte Carlo (MCMC) method we perform a global analysis constraining the dynamics of dark energy in light of the supernova (Riess "Gold" samples), galaxy clustering (SDSS 3D power spectra and SDSS lyman-αforest information) and the latest three-year Wilkinson Microwave Anisotropy Probe (WMAP) observations. We have allowed the dark energy equation of state to get across -1 and pay particular attention to the effects when incorrectly neglecting dark energy perturbations. We find the parameter space of dynamical dark energy is now well constrained and neglecting dark energy perturbations will make the parameter space significantly smaller. Dynamical dark energy model where the equation of state crosses -1 is mildly favored and the standard \LambdaCDM model is still a good fit to the current data.

7 pages, 5 figures Revtex4

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• A Dark Energy Model in Lyra Manifold
• Quintom cosmological model and some possible solutions using Lie and Noether symmetries
• Quantum cosmology with symmetry analysis for quintom dark energy model
• Dynamical evolutin of quintessence dark energy in collapsing dark matter halos
• Scalar Dark Energy Models and Scalar-Tensor Gravity: Theoretical Explanations for the Accelerated Expansion of Present Universe
• Dynamical system analysis in multiscalar-torsion cosmology