Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 16, Issue 7, Pages 1229-1242Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271807010717
Keywords
dark energy; CMB; SN; LSS
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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-alpha forest) 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 with w(z = 0.3) = -1.046(-0.086-0.196)(+0.096+0.226) (1, 2 sigma). Neglecting dark energy perturbations will make the parameter space of dark energy non-trivially smaller. The dynamical dark energy model where the equation of state crosses -1 is mildly favored and the standard Lambda CDM model is still a good fit to the current data.
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