标题： Witten环的动力稳定性 显示英文标题

标题： Dynamical Stability of Witten Rings

摘要： 宇宙环或涡旋体的动力学稳定性针对由威滕玻色子模型给出的特定状态方程进行了研究。 发现存在一个有限的状态参数范围，使得涡旋体状态实际上对动力学扰动是稳定的。 将电磁自作用包含到状态方程中会略微缩小稳定区域，但除此之外没有产生定性差异。 如果威滕玻色子模型是对更现实的弦模型的良好近似，那么宇宙涡旋体过剩问题只能通过假设弦是在低能标下形成，或者某些量子不稳定性可能以足够快的速率发展来解决。 显示英文摘要

摘要： The dynamical stability of cosmic rings, or vortons, is investigated for the particular equation of state given by the Witten bosonic model. It is found that there exists a finite range of the state parameter for which the vorton states are actually stable against dynamical perturbations. Inclusion of the electromagnetic self action into the equation of state slightly shrinks the stability region but otherwise yields no qualitative difference. If the Witten bosonic model represents a good approximation for more realistic string models, then the cosmological vorton excess problem can only be solved by assuming either that strings are formed at low energy scales or that some quantum instability may develop at a sufficient rate.