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Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED

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Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED

dc.contributor.author	Bennett, Jack J.
dc.contributor.author	Buldgen, Gilles
dc.contributor.author	Fernández de Salas, Pablo
dc.contributor.author	Drewes, Marco
dc.contributor.author	Gariazzo, Stefano
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Wong, Yvonne Y.Y.
dc.date.accessioned	2022-05-03T14:33:42Z
dc.date.available	2022-05-03T14:33:42Z
dc.date.issued	2021
dc.identifier.citation	Bennett, Jack J. Buldgen, Gilles Fernández de Salas, Pablo Drewes, Marco Gariazzo, Stefano Pastor Carpi, Sergio Wong, Yvonne Y.Y. 2021 Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED Journal Of Cosmology And Astroparticle Physics 04 073 073-1 073-31
dc.identifier.uri	https://hdl.handle.net/10550/82540
dc.description.abstract	We present in this work a new calculation of the standard-model benchmark value for the effective number of neutrinos, Neff-SM, that quantifies the cosmological neutrino-to-photon energy densities. The calculation takes into account neutrino flavour oscillations, finite-temperature effects in the quantum electrodynamics plasma to O(e3), where e is the elementary electric charge, and a full evaluation of the neutrino-neutrino collision integral. We provide furthermore a detailed assessment of the uncertainties in the benchmark Neff-SM value, through testing the value's dependence on (i) optional approximate modelling of the weak collision integrals, (ii) measurement errors in the physical parameters of the weak sector, and (iii) numerical convergence, particularly in relation to momentum discretisation. Our new, recommended standard-model benchmark is Neff-SM = 3.0440 ± 0.0002, where the nominal uncertainty is attributed predominantly to errors incurred in the numerical solution procedure (\|δNeff\| ∼10^-4), augmented by measurement errors in the solar mixing angle sin^2(θ12) (\|δ eff\| ∼10^-4).
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2021, vol. 04, num. 073, p. 073-1-073-31
dc.subject	Cosmologia
dc.subject	Astrofísica
dc.title	Towards a precision calculation of the effective number of neutrinos 𝖭_𝖾𝖿𝖿 in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
dc.type	journal article	es_ES
dc.date.updated	2022-05-03T14:33:42Z
dc.identifier.doi	10.1088/1475-7516/2021/04/073
dc.identifier.idgrec	152256
dc.rights.accessRights	open access	es_ES