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arXiv 0906.4501astro-ph.CO
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有或没有大质量中微子的动力学暗能量模型参数

Dynamical Dark Energy model parameters with or without massive neutrinos

G. La Vacca, J. R. Kristiansen

摘要:

我们使用WMAP 5和其他宇宙学数据来约束模型参数的精髓宇宙学,也专注于他们的转变时,我们允许非零中微子质量。这里使用Ratra-Peebles(RP)势和SUGRA势作为缓慢或快速变化的状态参数w(a)的例子。这两个势都依赖于能量标度Λ。在这里,我们证实了先前的分析结果与WMAP 3数据的上限的Λ,原来是相当小的(下降到约10^{-9}在RP宇宙学和~10^{-5}的SUGRA)。我们对Λ的限制并不受中微子质量作为自由参数的影响。相反,当中微子质量自由度开放时,其他参数的最佳拟合值发生显著变化。

英文摘要:

We use WMAP5 and other cosmological data to constrain model parameters in quintessence cosmologies, focusing also on their shift when we allow for non-vanishing neutrino masses. The Ratra-Peebles (RP) and SUGRA potentials are used here, as examples of slowly or fastly varying state parameter w(a). Both potentials depend on an energy scale Λ. Here we confirm the results of previous analysis with WMAP3 data on the upper limits on Λ, which turn out to be rather small (down to ~10^{-9} in RP cosmologies and ~10^{-5} for SUGRA). Our constraints on Λare not heavily affected by the inclusion of neutrino mass as a free parameter. On the contrary, when the neutrino mass degree of freedom is opened, significant shifts in the best-fit values of other parameters occur.

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