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arXiv 1007.2459gr-qc
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重建暗物质与暗能量的相互作用项

Reconstructing the interaction term between dark matter and dark energy

Freddy Cueva, Ulises Nucamendi

摘要:

本文将一种参数重建方法应用于均匀、各向同性、空间平坦的Friedmann-Robertson-Walker(FRW)宇宙学模型,该模型充满了具有常数状态方程参数的暗能量流体(DE)与暗物质(DM)相互作用.重建方法的基础上展开的一般相互作用项和相关的宇宙学变量的Chebyshev多项式,形成一个完整的正交函数。这个相互作用项描述了暗扇区内DE和DM之间的能量流交换。为了说明该方法是如何工作的,我们只根据前三个切比雪夫多项式来重建相互作用函数,并使用Ia型超新星SCP Union数据集(307 SNe-Ia)获得展开系数以及状态常数参数w的DE方程的最佳估计。初步的重建表明,在最好的情况下,有一个能量转移从DM到DE的宇宙符合的问题相比,LCDM模型恶化。我们的结论是,这一事实是一个严重的缺陷,暗组件之间存在这种相互作用的迹象。

英文摘要:

We apply a parametric reconstruction method to a homogeneous, isotropic and spatially flat Friedmann-Robertson-Walker (FRW) cosmological model filled of a fluid of dark energy (DE) with constant equation of state parameter interacting with dark matter (DM). The reconstruction method is based on expansions of the general interaction term and the relevant cosmological variables in terms of Chebyshev polynomials which form a complete set orthonormal functions. This interaction term describes an exchange of energy flow between the DE and DM within dark sector. To show how the method works we do the reconstruction of the interaction function expanding it in terms of only the first three Chebyshev polynomials and obtain the best estimation for the coefficients of the expansion as well as for the DE equation of the state constant parameter w using the type Ia Supernova SCP Union data set (307 SNe-Ia). The preliminary reconstruction shows that in the best scenario there is an energy transfer from DM to DE which worsen the problem of the cosmic coincidence in comparison with the LCDM model. We conclude that this fact is an indication of a serious drawback for the existence of such interaction between dark components.

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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