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 ΛCDM 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 indexof matter density perturbations is clearly different from that of the ΛCDM. The theoretical predictions of the model for the weighted growth rate were analyzed in the light of the fσ ₈-tension.

广义相对论的一种指数修正给出了可行的暗能量修正引力模型。该模型在出现有效宇宙常数的大曲率下表现为R − 2Λ，但在平坦时空中变为零。主要密度参数的宇宙演化与目前的观测结果一致。分析了太阳系的薄壳条件。除了满足宇宙学和局部重力限制外，该模型最近还可能显示出与 ΛCDM 的可测量差异。与物质功率谱相关的尺度的偏差参数m的当前值可以大于10 ^-6. 物质密度扰动的增长指数明显不同于ΛCDM。根据fσ _{8 -}张力分析了模型对加权增长率的理论预测。