Updated fundamental constant constraints from Planck 2018 data and possible relations to the Hubble tension
| Autor: | Jens Chluba, Luke Hart |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Particle physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cosmic microwave background Cosmic background radiation FOS: Physical sciences fundamental physics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences symbols.namesake 0103 physical sciences Planck 010303 astronomy & astrophysics CMB anisotropies Physics 010308 nuclear & particles physics Electron rest mass Astronomy and Astrophysics Fine-structure constant recombination Redshift Baryon Space and Planetary Science symbols cosmology Astrophysics - Cosmology and Nongalactic Astrophysics Hubble's law |
| Zdroj: | Hart, L & Chluba, J 2020, ' Updated fundamental constant constraints from Planck 2018 data and possible relations to the Hubble tension ', Monthly Notices of the Royal Astronomical Society, vol. 493, no. 3, pp. 3255-3263 . https://doi.org/10.1093/mnras/staa412 Monthly Notices of the Royal Astronomical Society |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We present updated constraints on the variation of the fine structure constant, $\alpha_{\rm EM}$, and effective electron rest mass, $m_{\rm e}$, during the cosmological recombination era. These two fundamental constants directly affect the ionization history at redshift $z\simeq 1100$ and thus modify the temperature and polarisation anisotropies of the cosmic microwave background (CMB) measured precisely with {\it Planck }. The constraints on $\alpha_{\rm EM}$ tighten slightly due to improved {\it Planck} 2018 polarisation data but otherwise remain similar to previous CMB analysis. However, a comparison with the 2015 constraints reveals a mildly discordant behaviour for $m_{\rm e}$, which from CMB data alone is found below its local value. Adding baryon acoustic oscillation data brings $m_{\rm e}$ back to the fiducial value, $m_{\rm e}=(1.0078\pm0.0067) m_{\rm e,0}$, and also drives the Hubble parameter to $H_0=69.1\pm 1.2$ [in units of ${\rm km \, s^{-1} \, Mpc^{-1} }$]. Further adding supernova data yields $m_{\rm e}=(1.0190\pm0.0055) m_{\rm e,0}$ with $H_0=71.24\pm0.96$. We perform several comparative analyses using the latest cosmological recombination calculations to further understand the various effects. Our results indicate that a single-parameter extension allowing for a slightly increased value of $m_{\rm e}$ ($\simeq 3.5\sigma$ above $m_{\rm e,0}$) could play a role in the Hubble tension. Comment: 8 pages, 8 figures, 4 tables; modified to copy the accepted MNRAS version |
| Databáze: | OpenAIRE |
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