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Comparing early dark energy and extra radiation solutions to the Hubble tension with BBN

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Title: Comparing early dark energy and extra radiation solutions to the Hubble tension with BBN
Authors: Seto, Osamu Browse this author
Toda, Yo Browse this author
Issue Date: 1-Jun-2021
Publisher: American Physical Society (APS)
Journal Title: Physical Review D
Volume: 103
Issue: 12
Start Page: 123501
Publisher DOI: 10.1103/PhysRevD.103.123501
Abstract: A shorter sound horizon scale at the recombination epoch, arising from introducing extra energy components such as extra radiation or early dark energy (EDE), is a simple approach to resolving the socalled Hubble tension. We compare EDE models, an extra radiation model, and a model in which EDE and extra radiation coexist, paying attention to the fit to big bang nucleosynthesis (BBN). We find that the fit to BBN in EDE models is somewhat poorer than that in the Lambda CDM model, because the increased inferred baryon asymmetry leads to a smaller deuterium abundance. We find that an extra radiation-EDE coexistence model gives the largest present Hubble parameter H-0 among the models studied. We also examine the differences between the results obtained with and without consideration of the BBN. The difference in the extra radiation model is 3.22 < N-eff < 3.49 (68%) for data sets without BBN and 3.16 < N-eff < 3.40 (68%) for data sets with BBN, which is so large that the 1s border of the larger side becomes the 2 sigma border.
Type: article
URI: http://hdl.handle.net/2115/82204
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)

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