For five phantom-capable dark-energy parameterizations, the growth index at redshift zero is about 0.54 with a negative slope, and the f-sigma-8 combination lies below the Lambda-CDM prediction over most of the redshift range shown.
Growth index and statefinder diagnostic of Oscillating Dark Energy
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abstract
We study is some detail the Cosmology of Oscillating Dark Energy described by concrete equations-of-state investigated recently in the literature. In particular, at the background level we compute the statefinder parameters, while at the level of linear cosmological perturbations we compute the growth index $\gamma$ as well as the combination parameter $A=f \sigma_8$. The comparison with $\Lambda$CDM is made as well.
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Evolution of matter perturbations in the context of cosmic slowing down
For five phantom-capable dark-energy parameterizations, the growth index at redshift zero is about 0.54 with a negative slope, and the f-sigma-8 combination lies below the Lambda-CDM prediction over most of the redshift range shown.