Studies on dark energy evolution

In this work we explore signatures of evolution for the dark energy density X(z) = ρ _de(z)/ρ _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 1σ for X(z). Extending the analysis up to 2σ, 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. (paper)