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Scalar field descriptions of two dark energy models

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arxiv 1706.10211 v1 pith:KYFHGMTH submitted 2017-06-30 astro-ph.CO

classification astro-ph.CO
keywords darkenergymodelsfieldlevelparameterizationsscalaraddition
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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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Cited by 1 Pith paper

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  1. Evolution of matter perturbations in the context of cosmic slowing down

    gr-qc 2026-08 conditional novelty 4.0 of 10

    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 redshi...

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