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arXiv 0704.2389hep-th
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巨磁振子的半经典量子化

Semiclassical Quantization of the Giant Magnon

Georgios Papathanasiou, Marcus Spradlin

摘要:

场论中的孤立子提供了一个窗口,使我们可以了解基本微扰自由度所不能直接达到的状态。出于对弦论在AdS_5 × S^5中的世界面S-矩阵的兴趣,在无限世界面体积的极限下,我们考虑了该理论中一个特殊孤子的半经典量子化:霍夫曼-马尔达塞纳“巨磁振子”自旋弦。我们获得了巨磁振子周围玻色子和费米子涨落的完整谱的显式公式。作为这些结果的一个应用,我们确认,单圈修正的经典能量消失,如预期的。

英文摘要:

Solitons in field theory provide a window into regimes not directly accessible by the fundamental perturbative degrees of freedom. Motivated by interest in the worldsheet S-matrix of string theory in AdS_5 x S^5 in the limit of infinite worldsheet volume we consider the semiclassical quantization of a particular soliton of this theory: the Hofman-Maldacena `giant magnon' spinning string. We obtain explicit formulas for the complete spectrum of bosonic and fermionic fluctuations around the giant magnon. As an application of these results we confirm that the one-loop correction to the classical energy vanishes as expected.

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