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arXiv 0711.0678hep-th
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快子扭结的微扰和模空间动力学

Perturbations and moduli space dynamics of tachyon kinks

Mark Hindmarsh, Huiquan Li

摘要:

不稳定D膜衰减为低一维稳定D膜的动力学过程可以用具有Dirac Born Infeld有效作用量的快子场来描述。在本文中,我们研究了快子场的波动模式周围的两个参数的家庭的静态解决方案表示一个数组的膜-反膜对。除了一对零模式与参数的解决方案,和不稳定性与湮灭的膜-反膜对,我们发现相应的状态的激发快子场周围的膜和散装。在膜厚度趋于零的极限下,本征模的支持仅限于膜,这与当快子场接近其基态时传播的快子模从谱中消失的想法一致。在此极限下,包括零模在内的低位激发态表现出4倍简并。最后,我们还讨论了对应于模空间中衰变过程的解的慢运动,找到了一条在不稳定D-膜和低一维的膜-反膜对之间周期振荡的轨迹.

英文摘要:

The dynamic process of unstable D-branes decaying into stable ones with one dimension lower can be described by a tachyon field with a Dirac-Born-Infeld effective action. In this paper we investigate the fluctuation modes of the tachyon field around a two-parameter family of static solutions representing an array of brane-antibrane pairs. Besides a pair of zero modes associated with the parameters of the solution, and instabilities associated with annihilation of the brane-antibrane pairs, we find states corresponding to excitations of the tachyon field around the brane and in the bulk. In the limit that the brane thickness tends to zero, the support of the eigenmodes is limited to the brane, consistent with the idea that propagating tachyon modes drop out of the spectrum as the tachyon field approaches its ground state. Low-lying excited states, including the zero modes, appear to show a 4-fold degeneracy in this limit. Finally, we also discuss the slow motion of the solution corresponding to the decay process in the moduli space, finding a trajectory which oscillates periodically between the unstable D-brane and the brane-antibrane pairs of one dimension lower.

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