Studies on dark energy evolution
  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.
