Hubble tension in lepton asymmetric cosmology with an extra radiation


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PhysRevD.104.063019.pdf

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/82983

Title:	Hubble tension in lepton asymmetric cosmology with an extra radiation
Authors:	Osamu, Seto Browse this author →KAKEN DB
Authors:	Yo, Toda Browse this author
Issue Date:	14-Sep-2021
Publisher:	American Physical Society (APS)
Journal Title:	Physical Review D
Volume:	104
Issue:	6
Start Page:	063019-1
End Page:	063019-7
Publisher DOI:	10.1103/PhysRevD.104.063019
Abstract:	We study the fit of cosmological models with two additional free parameters N-eff and xi(e) in addition to the parameters of.CDM. We introduce extra radiation components such as hot axions or sterile neutrinos in addition to the energy density of neutrinos with large neutrino degeneracy. Then, a larger N-eff is allowed without spoiling big bang nucleosynthesis (BBN), as positive neutrino degeneracy xi(e) could improve BBN fit. By analysing the data from Planck, baryon acoustic oscillation (BAO), BBN and type-Ia supernovae (SNeIa), it can be seen that the Hubble tension can be ameliorated for xi(e) similar or equal to 0.04 and 0.3 less than or similar to Delta N-eff less than or similar to 0.6.
Rights:	©2021 American Physical Society
Type:	article
URI:	http://hdl.handle.net/2115/82983
Appears in Collections:	理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc) 高等教育推進機構 (Institute for the Advancement of Higher Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 瀬戸治

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