http://arxiv.org/abs/2211.05956
We revisit the constraint results of different dynamical dark energy models including the Chevallier-Polarski-Linder (CPL) model with $w(z)=w_{0}+w_{1}\frac{z}{1+z}$ and the other two models with the logarithm parametrization of $w(z)=w_{0}+w_{1}\left(\frac{\ln (2+z)}{1+z}-\ln 2\right)$ and the oscillating parametrization of $w(z)=w_{0}+w_{1}\left(\frac{\sin(1+z)}{1+z}-\sin(1)\right)$. The advantage over the CPL model is that the latter two parametrizations for dark energy can explore the whole evolution history of the universe properly. Using the current latest mainstream observations including the cosmic microwave background and the baryon acoustic oscillation as well as the type Ia supernovae, we perform the $\chi^2$ statistic analysis to global fit these models, finding that the logarithm parametrization and the oscillating parametrization are slightly preferred against the CPL scenario. We constrain the total neutrino mass in these dynamical dark energy models. We find that, compared with those in the CPL model, much looser constraints on $\sum m_{\nu}$ are obtained in the logarithm model and the oscillating model. Consideration of the possible mass ordering of neutrinos reveals that the most stringent constraint on $\sum m_{\nu}$ appears in the degenerate hierarchy case. In addition, we confirm that the normal hierarchy case is slightly favored over the inverted one.
R. Guo, T. Yao, X. Zhao, et. al.
Mon, 14 Nov 22
19/69
Comments: N/A