Astrophysics > Cosmology and Nongalactic Astrophysics
[Submitted on 1 Jun 2012
]
Title: A New Class of Parametrization for Dark Energy without Divergence
Title: 暗能量无发散的新类参数化方法
Abstract: In this paper, we propose a new class of parametrization of the equation of state of dark energy. In contrast with the famous CPL parametrization, these new parametrization of the equation of state does not divergent during the evolution of the Universe even in the future. Also, we perform a observational constraint on two simplest dark energy models belonging to this new class of parametrization, by using the Markov Chain Monte Carlo (MCMC) method and the combined latest observational data from the type Ia supernova compilations including Union2(557), cosmic microwave background, and baryon acoustic oscillation.
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