BAO signatures in the 2-point angular correlations and the Hubble tension

Autor(es)

Nunes, Rafael C. ^[1] ; Bernui, Armando ^[2]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Div Astrofis, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Observatorio Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN PHYSICAL JOURNAL C; v. 80, n. 11 NOV 5 2020.
• Citações Web of Science: 0

Resumo

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, theta 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 H0=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 theta(BAO)+BBN+H0LiCOW and theta 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 theta(BAO)+BBN+H0LiCOW) and r(d) = 150.4(-3.3)(+2.7) Mpc (from theta(BAO)+BBN+CC). In a second round of analysis, we test how the presence of a possible spatial curvature, Omega(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, theta(BAO), jointly with other model-independent measurements, in such a way that the tension on the Hubble parameter can be alleviated. (AU)

• Processo FAPESP: 18/18036-5 - Investigando aspectos físicos além do modelo padrão ligados aos temas de energia escura, gravidade modificada, neutrinos e ondas gravitacionais
• Beneficiário: Rafael da Costa Nunes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado