论文标题
物质密度扰动的生长在4D爱因斯坦 - 加斯 - 托网重力中
Growth of matter density perturbations in 4D Einstein-Gauss-Bonnet gravity
论文作者
论文摘要
最近，引入了四个维度的新型爱因斯坦 - 加斯 - 邦网的重力[物理学。莱特牧师。 124（2020）081301]。我们将详细研究该模型的宇宙学后果。我们将考虑线性物质密度扰动，并估算相关的修饰重力参数。特别是，我们将集中精力在FRW几何形状上的非相关物质扰动的增长率，并表明，对于高斯桥耦合常数狭窄范围，将满足观察性数据。在本文中，结果表明，对于耦合常数的足够大值，建议的$σ_8$将变得大于$λ$ CDM值。
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.
