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.
Scalar field descriptions of two dark energy models
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abstract
We give a scalar field description of two dark energy parameterizations, and we analyze in detail its cosmology both at the level of background evolution and at the level of linear perturbations. In particular, we compute the statefinder parameters and the growth index as functions of the red-shift for both dark energy parameterizations, and the comparison with the $\Lambda CDM$ model as well as with a few well-known geometrical dark energy models is shown. In addition, the combination parameter $A=f \sigma_8$ of both models is compared against current data.
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gr-qc 1years
2026 1verdicts
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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.