Why three generations?
Abstract
Here, we discuss an anthropic explanation of why there exist three generations of fermions. If one assumes that the right-handed neutrino sector is responsible for both the matter-antimatter asymmetry and the dark matter, then anthropic selection favors three or more families of fermions. For successful leptogenesis, at least two right-handed neutrinos are needed, while the third right-handed neutrino is invoked to play the role of dark matter. The number of the right-handed neutrinos is tied to the number of generations by the anomaly constraints of the U(1)B-L gauge symmetry. Combining anthropic arguments with observational constraints, we obtain predictions for the X-ray observations, as well as for neutrinoless double-beta decay.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1253026
- Alternate Identifier(s):
- OSTI ID: 1285777
- Grant/Contract Number:
- SC0009937
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters B
- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 758 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; warm dark-matter; sterile neutrinos; massive neutrinos; x-ray; ursa-minor; search; leptogenesis; unification; constraints; decays
Citation Formats
Ibe, Masahiro, Kusenko, Alexander, and Yanagida, Tsutomu T. Why three generations?. Netherlands: N. p., 2016.
Web. doi:10.1016/j.physletb.2016.05.025.
Ibe, Masahiro, Kusenko, Alexander, & Yanagida, Tsutomu T. Why three generations?. Netherlands. https://doi.org/10.1016/j.physletb.2016.05.025
Ibe, Masahiro, Kusenko, Alexander, and Yanagida, Tsutomu T. Fri .
"Why three generations?". Netherlands. https://doi.org/10.1016/j.physletb.2016.05.025.
@article{osti_1253026,
title = {Why three generations?},
author = {Ibe, Masahiro and Kusenko, Alexander and Yanagida, Tsutomu T.},
abstractNote = {Here, we discuss an anthropic explanation of why there exist three generations of fermions. If one assumes that the right-handed neutrino sector is responsible for both the matter-antimatter asymmetry and the dark matter, then anthropic selection favors three or more families of fermions. For successful leptogenesis, at least two right-handed neutrinos are needed, while the third right-handed neutrino is invoked to play the role of dark matter. The number of the right-handed neutrinos is tied to the number of generations by the anomaly constraints of the U(1)B-L gauge symmetry. Combining anthropic arguments with observational constraints, we obtain predictions for the X-ray observations, as well as for neutrinoless double-beta decay.},
doi = {10.1016/j.physletb.2016.05.025},
journal = {Physics Letters B},
number = C,
volume = 758,
place = {Netherlands},
year = {Fri Jul 01 00:00:00 EDT 2016},
month = {Fri Jul 01 00:00:00 EDT 2016}
}
https://doi.org/10.1016/j.physletb.2016.05.025
Web of Science