Another Observational Problem For LambdaCDM

Every time you turn around there is another conflict between the ΛCDM Standard Model of Cosmology and observational evidence from astronomy.

A promising way to test the physics of the accelerated expansion of the Universe is by studying the growth rate of matter fluctuations, which can be parameterized by the matter energy density parameter to the power γ, the so-called growth index. It is well-known that the ΛCDM cosmology predicts γ = 0.55. However, using observational data, Ref. Nguyen:2023 measured a much higher γ = 0.633 + 0.025 − 0.024, excluding the ΛCDM value within 3.7σ.

From here.

The linked study casts doubt on the hypothesis that dark energy can explain this discrepancy.