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Q-ball Instability due to U(1) Breaking

Masahiro Kawasaki·Kenichiro Konya·Fuminobu Takahashi
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Abstract

Q-ball is a non-topological 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.

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Masahiro Kawasaki, Kenichiro Konya, Fuminobu Takahashi. 2005-05-24. Q-ball Instability due to U(1) Breaking. https://doi.org/10.1016/j.physletb.2005.05.082

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