SIMBAD references

2020MNRAS.498.3624L - Mon. Not. R. Astron. Soc., 498, 3624-3632 (2020/November-1)

Constraints on the electron-to-proton mass ratio variation at the epoch of reionization.

LEVSHAKOV S.A., KOZLOV M.G. and AGAFONOVA I.I.

Abstract (from CDS):

Far-infrared fine-structure transitions of [C I] and [C II] and rotational transitions of CO are used to probe hypothetical variations of the electron-to-proton mass ratio µ = m_e/m_p at the epoch of reionization (z > 6). A constraint on Δµ/µ = (µ_obs - µ_lab)/µ_lab = (0.7 ± 1.2) x 10^–5 (1σ) obtained at {bar}z = 6.31 is the most stringent up-to-date limit on the variation of µ at such high redshift. For all available estimates of Δµ/µ ranging between z = 0 and z ∼ 1100, the epoch of recombination, a regression curve Δµ/µ = k_µ(1 + z)^p, with k_µ = (1.6 ± 0.3) x 10^–8 and p = 2.00 ± 0.03, is deduced. If confirmed, this would imply a dynamical nature of dark matter/dark energy.

Journal keyword(s): elementary particles - techniques: spectroscopic - quasars: individual: (J0439+1634, J2310+1855) - cosmological parameters - cosmology: observations

Simbad objects: 27

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