BAO signatures in the 2-point angular correlations and the Hubble tension
Abstract An observational tension on estimates of the Hubble parameter, $$H_0$$ H 0 , using early and late Universe information, is being of intense discussion in the literature. Additionally, it is of great importance to measure $$H_0$$ H 0 independently of CMB data and local distance ladder method...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-11-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-08601-8 |
| Summary: | Abstract An observational tension on estimates of the Hubble parameter, $$H_0$$ H 0 , using early and late Universe information, is being of intense discussion in the literature. Additionally, it is of great importance to measure $$H_0$$ H 0 independently of CMB data and local distance ladder method. In this sense, we analyze 15 measurements of the transversal BAO scale, $$\theta _\mathrm{BAO}$$ θ BAO , obtained in a weakly model-dependent approach, in combination with other data sets obtained in a model-independent way, namely, Big Bang Nucleosynthesis (BBN) information, 6 gravitationally lensed quasars with measured time delays by the H0LiCOW team, and measures of cosmic chronometers (CC). We find $$H_0 = 74.88_{-2.1}^{+1.9}$$ H 0 = 74 . 88 - 2.1 + 1.9 km s $${}^{-1}$$ - 1 Mpc $${}^{-1}$$ - 1 and $$H_0 = 72.06_{-1.3}^{+1.2}$$ H 0 = 72 . 06 - 1.3 + 1.2 km s $${}^{-1}$$ - 1 Mpc $${}^{-1}$$ - 1 from $$\theta _{BAO}$$ θ BAO +BBN+H0LiCOW and $$\theta _{BAO}$$ θ BAO +BBN+CC, respectively, in fully accordance with local measurements. Moreover, we estimate the sound horizon at drag epoch, $$r_\mathrm{d}$$ r d , independent of CMB data, and find $$r_\mathrm{d}=144.1_{-5.5}^{+5.3}$$ r d = 144 . 1 - 5.5 + 5.3 Mpc (from $$\theta _{BAO}$$ θ BAO +BBN+H0LiCOW) and $$r_\mathrm{d} =150.4_{-3.3}^{+2.7}$$ r d = 150 . 4 - 3.3 + 2.7 Mpc (from $$\theta _{BAO}$$ θ BAO +BBN+CC). In a second round of analysis, we test how the presence of a possible spatial curvature, $$\Omega _k$$ Ω k , can influence the main results. We compare our constraints on $$H_0$$ H 0 and $$r_\mathrm{d}$$ r d with other reported values. Our results show that it is possible to use a robust compilation of transversal BAO data, $$\theta _{BAO}$$ θ BAO , jointly with other model-independent measurements, in such a way that the tension on the Hubble parameter can be alleviated. |
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| ISSN: | 1434-6044 1434-6052 |