Speaker
Masahiro Kawasaki
Description
The recent observation of ${}^4$He 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. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent $^4$He measurement can be realized. Furthermore, the produced L-balls dominate the Universe and their rapid decay enhances the background gravitational waves through the Poltergeist mechanism.
Author
Masahiro Kawasaki
