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arXiv 1807.01995gr-qc
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用$\texttt{hi_class}$检验Horndeski引力作为暗物质

Testing Horndeski gravity as dark matter with $\texttt{hi_class}$

Alessandro Casalino, Massimiliano Rinaldi

摘要:

我们考虑了一个基于Horndeski引力扇区的暗物质流体模型。该模型在背景水平上非常成功地再现了宇宙从早期到今天的演化。然而,在微扰水平上,模型失败了。为了证明这一点,我们使用代码$\texttt{hi_class}$,我们计算的物质功率谱和宇宙微波背景谱。我们的研究结果证实,在一个新的和独立的方式,这一部门的Horndeski引力是不可行的,在最近的限制来自引力波的速度测量获得的观测中子星合并事件GW 170817的协议。

英文摘要:

We consider a model of dark matter fluid based on a sector of Horndeski gravity. The model is very successful, at the background level, in reproducing the evolution of the Universe from early times to today. However, at the perturbative level the model fails. To show this, we use the code $\texttt{hi_class}$ and we compute the matter power spectrum and the cosmic microwave background spectrum. Our results confirm, in a new and independent way, that this sector of Horndeski gravity is not viable, in agreement with the recent constraints coming from the measurement of the speed of gravitational waves obtained from the observation of the neutron star merger event GW170817.

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