论文标题
$λ$ CDM没有宇宙常数
$Λ$CDM without cosmological constant
论文作者
论文摘要
对一般相对论的一种指数校正可为深色能量的重力模型可行。该模型在出现有效的宇宙常数的大曲率下表现为$ r-2λ$，但在平坦的时空中变为零。主密度参数的宇宙演化与当前观测值一致。分析了太阳系的薄外壳条件。除了满足宇宙学和局部重力限制外，该模型还可能显示出可衡量的差异，最近时间$λ$ CDM。与物质功率谱相关的比例的偏差参数$ m $的当前值可能大于$ 10^{ - 6} $。物质密度扰动的增长指数显然与$λ$ CDM的增长指数不同。根据$fσ_8$ - 张力，分析了该模型对加权生长速率的理论预测。
A type of exponential correction to General Relativity gives viable modified gravity model of dark energy. The model behaves as $R-2Λ$ at large curvature where an effective cosmological constant appears, but it becomes zero in flat space time. The cosmic evolution of the main density parameters is consistent with current observations. The thin shell conditions for the Solar system were analyzed. Apart from satisfying cosmological and local gravity restrictions, the model may also show measurable differences with $Λ$CDM at recent times. The current value of the deviation parameter $m$ for scales relevant to the matter power spectrum can be larger than $10^{-6}$. The growth index of matter density perturbations is clearly different from that of the $Λ$CDM. The theoretical predictions of the model for the weighted growth rate were analyzed in the light of the $fσ_8$-tension.
