Studies on dark energy evolution

Abstract

In this work we explore signatures of evolution for the dark energy density $X(z)={\rho }_{de}(z)/{\rho }_{de}(0)$ using latest observations on SNIa and H(z). The models consist of parametrizations of the dark energy density and consequently a reconstruction for the EoS parameter w(z) as a function of redshift. Both parametrization methods using the SH0Es prior results in a small deviation from LCDM at 1$\sigma$ for $X(z)$. Extending the analysis up to 2$\sigma$, the evidence for evolution of $X(z)$ dilute in both cases. We have also studied an interacting dark model where this trend is also found.

arXiv comment11 pages, 17 figures

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• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
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• Dark energy by natural evolution: Constraining dark energy using Approximate Bayesian Computation
• Reconstructing dark energy with model independent methods after DESI DR2 BAO
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