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arXiv 0706.4142astro-phhep-ph
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重子物质和暗组分的统一模型

Unified model of baryonic matter and dark components

Luis Chimento, Monica Forte

摘要:

本文研究了一个相互作用的双流体宇宙模型,并通过单个能量密度的线性组合引入了标量场表示。应用可积性条件的标量场方程,我们表明,这种“异国情调的精髓”是由一个指数势和两种流体的混合物可以被认为是一个模型的三个组件。这些成分分别与重子物质、暗物质和暗能量有关。我们使用Simon,Verde和Jimenez(2005)确定的哈勃参数的红移依赖性来约束这个模型的电流密度参数。利用最佳拟合密度参数,我们得到了非加速区和加速区之间的跃迁红移值z_{acc} =0.66,以及从初始奇点开始的时间t_0= 19.8 Gyr。我们研究了该模型的微扰演化,发现微扰的能量密度随宇宙学时间而减小。

英文摘要:

We investigate an interacting two-fluid cosmological model and introduce a scalar field representation by means of a linear combination of the individual energy densities. Applying the integrability condition to the scalar field equation we show that this "exotic quintessence" is driven by an exponential potential and the two-fluid mixture can be considered as a model of three components. These components are associated with baryonic matter, dark matter and dark energy respectively. We use the Simon, Verde & Jimenez (2005) determination of the redshift dependence of the Hubble parameter to constrain the current density parameters of this model. With the best fit density parameters we obtain the transition redshift between non accelerated and accelerated regimes z_{acc}=0.66 and the time elapsed since the initial singularity t_0= 19.8 Gyr. We study the perturbation evolution of this model and find that the energy density perturbation decreases with the cosmological time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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