http://arxiv.org/abs/2002.09293

Current data analyses combine diverse cosmological probes to break degeneracy between cosmological parameters using, for instance, the data from Type IA supernova data or from Baryon Acoustic Oscillations (BAO). Regarding the use of the BAO data, this can lead to biased inferences of the cosmological parameters in study because the comoving BAO sound horizon at drag epoch, $r_{\rm drag}$, used to quantify the BAO measurements $H(z)$ and $D_{A}(z)$, is inferred from a combination of cosmic microwave background (CMB) data and a theoretical model, as WMAP and Planck collaborations did. One can avoid possibly biased analyses combining CMB data in conjunction with a set of 15 measurements of the transversal BAO scale, considered cosmological model-independent to explore, via Monte Carlo Markov chains, the parametric space of some cosmological models. We investigate how much Planck CMB data in combination with transversal BAO measurements can constraints the minimum $\Lambda$CDM model, and extensions including additional parameters as $r_{\rm drag}$, neutrinos mass scale $M_{\nu}$, and the possibility for a dynamical dark energy model. Assuming the $\Lambda$CDM cosmology, we find $H_0 = 69.23 \pm 0.50$ km s${}^{-1}$ Mpc${}^{-1}$, $M_{\nu} < 0.11$ eV and $r_{\rm drag} = 147.59 \pm 0.26$ Mpc from Planck + transversal BAO data. When assuming a dynamical dark energy cosmology, we find that the inclusion of the BAO data can indeed break the degeneracy of the dark energy free parameters, improving the constraints on the full parameter space significantly. We note that the model is compatible with local measurements of $H_0$ and there is no tension on $H_0$ estimates. Also, we discuss the results from a joint analysis with the latest local $H_0$ measurement. Finally, we perform a model-independent analysis for the deceleration parameter $q(z)$ from our compilation of the transversal BAO data.

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R. Nunes, S. Yadav, J. Jesus, et. al.
Mon, 24 Feb 20
34/49

Comments: 15 pages, 10 figures, 4 tables. Comments are welcome