Q-ball instability due to U(1) breaking

Masahiro Kawasaki, Kenichiro Konya, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Q-ball is a nontopological soliton whose stability is ensured by global U(1) symmetry. We study a Q-ball which arises in the Affleck-Dine mechanism for baryogenesis and consider its possible instability due to U(1) breaking term (A-term) indispensable for successful baryogenesis. It is found that the instability destroys the Q-ball if its growth rate exceeds inverse of the typical relaxation time scale of the Q-ball. However, the instability is not so strong as it obstructs the cosmological formation of the Q-balls.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 2005 Jul 21


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