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arXiv 2102.12758astro-ph.COgr-qchep-phhep-th
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针对$H_0$和$σ_8$张力运行真空

Running vacuum against the $H_0$ and $σ_8$ tensions

Joan Sola, Adria Gomez-Valent, Javier de Cruz Perez, Cristian Moreno-Pulido

摘要:

宇宙学项$Λ$是$104$多年前由爱因斯坦在引力场方程中引入的。$Λ$是宇宙学中的刚性量还是动力学变量多年来一直是一个争论的问题,特别是在引入暗能量(DE)的一般概念之后。$Λ$与真空能量密度$ρ_{\rm vac}$相关,人们可以预期它随着宇宙膨胀而缓慢演化。在这里,我们提出了一个专门的研究测试这种可能性,使用有前途的类运行真空模型(RVM的)。我们使用一个大字符串$SNIa+BAO+H(z)+LSS+CMB$的现代宇宙学数据,其中CMB部分首次涉及到完整的普朗克2018年可能性,这些模型。我们测试的依赖性的阈值红移$z_*$的真空动力学激活在最近的过去,并找到积极的信号$\sim4.0σ$ $z_*\simeq 1$的结果。相对于标准的$Λ$ CDM模型,RVM证明是非常有竞争力的,并且为解决$σ_8$张力和缓解$H_0$张力提供了一个手柄。

英文摘要:

The cosmological term, $Λ$, was introduced $104$ years ago by Einstein in his gravitational field equations. Whether $Λ$ is a rigid quantity or a dynamical variable in cosmology has been a matter of debate for many years, especially after the introduction of the general notion of dark energy (DE). $Λ$ is associated to the vacuum energy density, $ρ_{\rm vac}$, and one may expect that it evolves slowly with the cosmological expansion. Herein we present a devoted study testing this possibility using the promising class of running vacuum models (RVM's). We use a large string $SNIa+BAO+H(z)+LSS+CMB$ of modern cosmological data, in which for the first time the CMB part involves the full Planck 2018 likelihood for these models. We test the dependence of the results on the threshold redshift $z_*$ at which the vacuum dynamics is activated in the recent past and find positive signals up to $\sim4.0σ$ for $z_*\simeq 1$. The RVM's prove very competitive against the standard $Λ$CDM model and give a handle for solving the $σ_8$ tension and alleviating the $H_0$ one.

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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