Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/08/041
Keywords
big bang nucleosynthesis; leptogenesis; physics of the early universe; supersymmetry and cosmology
Funding
- JSPS KAKENHI [20H05851, 21K03567, JP20J20248]
- World Premier International Research Center Initiative (WPI Initiative) , MEXT, Japan
- Program of Excellence in Photon Science
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By studying the Affleck-Dine mechanism and the formation and evolution of L-balls, we conclude that the recent observation of He-4 suggests a significant lepton asymmetry in the universe.
The recent observation of He-4 implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number is confined in them. The L-balls protect the generated lepton number from being converted to baryon number through the sphaleron processes. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent He-4 measurement can be realized.
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