Neutrino-mixing-generated lepton asymmetry and the primordial He abundance
Physical Review D - Particles, Fields, Gravitation and Cosmology, ISSN: 0556-2821, Vol: 60, Issue: 6, Page: 1-7
1999
- 28Citations
- 1Captures
Metric Options: Counts1 Year3 YearSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
It has been proposed that an asymmetry in the electron neutrino sector may be generated by resonant active-sterile neutrino transformations during big bang nucleosynthesis (BBN). We calculate the change in the primordial He yield Y resulting from this asymmetry, taking into account both the time evolution of the ν and ν̄ distribution function and the spectral distortions in these. We calculate this change in two schemes: (1) a lepton asymmetry directly generated by ν mixing with a lighter right-handed sterile neutrino ν, and (2) a lepton asymmetry generated by a ν↔ν or ν↔ν transformation which is subsequently partially converted to an asymmetry in the νν̄ sector by a matter-enhanced active-active neutrino transformation. In the first scheme, we find that the percentage change in Y is between -1% and 9% (with the sign depending on the sign of the asymmetry), bounded by the Majorana mass limit m≲1 eV. In the second scheme, the maximal percentage reduction in Y is 2%, if the lepton number asymmetry in neutrinos is positive; otherwise, the percentage increase in Y is ≲5% for m-m≲10 eV. We conclude that the change in the primordial He yield induced by a neutrino-mixing-generated lepton number asymmetry can be substantial in the upward direction, but limited in the downward direction. ©1999 The American Physical Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=18044372623&origin=inward; http://dx.doi.org/10.1103/physrevd.60.063002; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85037195559&origin=inward; https://link.aps.org/doi/10.1103/PhysRevD.60.063002; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.60.063002/fulltext; http://link.aps.org/article/10.1103/PhysRevD.60.063002
American Physical Society (APS)
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know