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arXiv 2111.08151astro-ph.CO
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从宇宙学数据测量真空能量密度

Vacuum Energy Density Measured from Cosmological Data

J. Prat, C. Hogan, C. Chang, J. Frieman

备注：
8 + 11 pages, 4 figures. Published by JCAP
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摘要：

在$Λ$ CDM宇宙学模型中，爱因斯坦的宇宙学常数$Λ$的绝对值，有时表示为物理真空的引力质量-能量密度$ρ_Λ$，是一个基本的自然常数，它的精确测量在测试一些量子引力理论中起着核心作用。几个目前公开的宇宙学数据的组合和一个假设的平面$Λ$ CDM宇宙学模型在这里使用的联合贝叶斯推断的组合的常规参数$Ω_Λh^2$对应的绝对物理密度$ρ_Λ$。在物理单位，我们得到$ρ_Λ= \left(60.3\pm{1.3}\right)\times 10^{-31}{\rm g/cm^3}$，迄今为止最准确的约束，宇宙学测量的基础上CMB温度的绝对校准。使用局部距离标度进行校准时，得到的值会有很大的不同，这主要与哈勃常数值的系统差异有关。建议未来的宇宙学参数研究假设$Λ$ CDM模型包括真空密度的约束。

英文摘要：

Within the $Λ$CDM cosmological model, the absolute value of Einstein's cosmological constant $Λ$, sometimes expressed as the gravitating mass-energy density $ρ_Λ$ of the physical vacuum, is a fundamental constant of nature, whose accurate measurement plays a central role in testing some proposed theories of quantum gravity. Several combinations of currently public cosmological data and an assumed flat $Λ$CDM cosmological model are used here to make a joint Bayesian inference on the combination of conventional parameters $Ω_Λh^2$ that corresponds to the absolute physical density $ρ_Λ$. In physical units, we obtain $ρ_Λ= \left(60.3\pm{1.3}\right)\times 10^{-31}{\rm g/cm^3}$, the most accurate constraint to date, with an absolute calibration of cosmological measurements based on CMB temperature. Significantly different values are obtained with calibrations that use a local distance scale, mainly connected to systematic differences in the value of the Hubble constant. It is suggested that future comprehensive cosmological parameter studies assuming the $Λ$CDM model include constraints on the vacuum density.

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