Q-ball Instability due to U(1) Breaking

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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6 pages, 8 figures, reference and a few explanatory comments were added

Scientific paper

10.1016/j.physletb.2005.05.082

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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