arXiv subjects

Daniela Grandon

Publications and source records attributed to Daniela Grandon.

2 recordsLinked to original sources

arXiv2021

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.

astro-ph.CO↗

arXiv2018

Exploring evidence of interaction between dark energy and dark matter

In this work we use the latest observations on SNIa, $H(z)$, BAO, $f_{gas}$ in clusters and CMBR, to constrain three models showing an explicit interaction between dark matter and dark energy. In particular, we use the BOSS BAO measurements at $z \simeq 0.32$, $0.57$ and $2.34$, using the full 2-dimensional constraints on the angular and line of sight BAO scale. We find that using all five observational probes together, two of the interaction models show positive evidence at more than 3 $ σ$. Although significant, further study is needed to establish this statement firmly.

astro-ph.CO↗