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BAO signatures in the 2-point angular correlations and the Hubble tension
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Journal Article
BAO signatures in the 2-point angular correlations and the Hubble tension
2020
Overview
An observational tension on estimates of the Hubble parameter,
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
independently of CMB data and local distance ladder method. In this sense, we analyze 15 measurements of the transversal BAO scale,
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
km s
-
1
Mpc
-
1
and
H
0
=
72
.
06
-
1.3
+
1.2
km s
-
1
Mpc
-
1
from
θ
BAO
+BBN+H0LiCOW and
θ
BAO
+BBN+CC, respectively, in fully accordance with local measurements. Moreover, we estimate the sound horizon at drag epoch,
r
d
, independent of CMB data, and find
r
d
=
144
.
1
-
5.5
+
5.3
Mpc (from
θ
BAO
+BBN+H0LiCOW) and
r
d
=
150
.
4
-
3.3
+
2.7
Mpc (from
θ
BAO
+BBN+CC). In a second round of analysis, we test how the presence of a possible spatial curvature,
Ω
k
, can influence the main results. We compare our constraints on
H
0
and
r
d
with other reported values. Our results show that it is possible to use a robust compilation of transversal BAO data,
θ
BAO
, jointly with other model-independent measurements, in such a way that the tension on the Hubble parameter can be alleviated.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V,SpringerOpen
