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arXiv 2005.01636gr-qc
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四维Einstein-Gauss-Bonnet引力中物质密度扰动的增长

Growth of matter density perturbations in 4D Einstein-Gauss-Bonnet gravity

Zahra Haghani

摘要:

最近,一个新的爱因斯坦-高斯-邦纳引力在四维已被引入[物理。124(2020)081301]。我们将详细研究这个模型的宇宙学后果。我们将考虑线性物质密度扰动,并估计相关的修正重力参数。特别是,我们将集中在非相对论性的物质扰动的增长率上的FRW几何,并表明,对于一个狭窄的范围内的高斯-博内耦合常数,观测数据将得到满足。在本文中,它表明,足够大的值的耦合常数,建议的$σ_8$将成为大于$Λ$ CDM值。

英文摘要:

Recently, a novel Einstein-Gauss-Bonnet gravity in four dimensions has been introduced [Phys. Rev. Lett. 124 (2020) 081301]. We will investigate cosmological consequences of this model in details. We will consider linear matter density perturbations and also estimate relevant modified gravity parameters. Specially we will concentrate on the growth rate of non-relativistic matter perturbations on top of FRW geometry and show that for a narrow range of the Gauss-Bonnet coupling constant, observational data will be satisfied. In this paper, it is shown that for enough large values of the coupling constant, the suggested $σ_8$ will become greater than $Λ$CDM value.

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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