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arXiv 1104.4804hep-th
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AdS_3中折叠串的分裂

Splitting of folded strings in AdS_3

E. M. Murchikova

摘要:

本文给出了AdS_3中折叠自旋弦分裂的半经典计算,这在AdS/CFT对偶中可能是有意义的。我们从一个经典的闭弦开始,假设它可以分裂成两个闭弦碎片,如果在给定的时间,它的两个点在目标空间重合,并且它们的速度一致。首先我们考虑具有大自旋的折叠弦的情形。假设AdS_3中折叠弦解的形式大自旋近似,我们可以完整地描述分裂的过程:计算全部电荷集,得到描述末态演化的弦解。我们发现,在这个极限下,世界表面在这个过程中不发生变化,最终态由与初始弦相同类型的解描述,即AdS_3中折叠弦的形式大自旋近似。然后我们考虑一般情况--由折叠弦的精确解给出的弦的分裂。我们找到了最终碎片的电荷表达式,对角化它们的坐标变换,最后,它们的能量和自旋。由于初始弦轮廓的复杂性,我们无法找到描述最终碎片演化的解,但我们可以预测它们的定性行为。我们还将结果推广到包括S^5中的圆旋转和缠绕。

英文摘要:

In this paper we present semiclassical computations of the splitting of folded spinning strings in AdS_3, which may be of interest in the context of AdS/CFT duality. We start with a classical closed string and assume that it can split on two closed string fragments, if at a given time two points on it coincide in target space and their velocities agree. First we consider the case of the folded string with large spin. Assuming the formal large-spin approximation of the folded string solution in AdS_3, we can completely describe the process of splitting: compute the full set of charges and obtain the string solutions describing the evolution of the final states. We find that, in this limit, the world surface does not change in the process and the final states are described by the solutions of the same type as the initial string, i.e. the formal large-spin approximation of the folded string in AdS_3. Then we consider the general case --- splitting of string given by the exact folded string solution. We find the expressions for the charges of the final fragments, the coordinate transformations diagonalizing them and, finally, their energies and spins. Due to the complexity of the initial string profile, we cannot find the solutions describing the evolution of the final fragments, but we can predict their qualitative behavior. We also generalize the results to include circular rotations and windings in S^5.

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