Li 2006 用SNe，WMAP，SDSS，2dFGRS和伽玛暴限制暗能量

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astro-ph/0612060 [abs, ps, pdf, other] :

Title: Constraints on Dynamical Dark Energy Models Including Gamma Ray Bursts
Authors: Hong Li, Meng Su, Zuhui Fan, Zigao Dai, Xinmin Zhang
Comments: 6 pages and 2 figures

In this paper we analyze the constraints on the property of dark energy from cosmological observations. We include 52 long Gamma-Ray Bursts (GRBs) data in our study. Together with SNe Ia Gold sample, WMAP, SDSS and 2dFGRS data, we perform global fitting using Markov Chain Monte Carlo (MCMC) technique. Dark energy perturbations are explicitly considered. We pay particular attention to the time evolution of the equation of state of dark energy parameterized as w_{DE}=w_o+w_a(1-a) with a the scale factor of the universe, emphasizing the complementarity of high redshift GRBs to other cosmological probes. It is found that the constraints on dark energy become stringent by taking into account high redshift GRBs, especially for w_a, which delineates the evolution of dark energy. The best fitting dark energy model has w_0=-1.09 and w_a=0.89. The cosmological constant with w_0=-1 and w_a=0 is well within 2\sigma range.