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arXiv 1111.0564hep-th
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镜像TBA中的束缚态

Bound States in the Mirror TBA

Gleb Arutyunov, Sergey Frolov, Stijn J. van Tongeren

摘要:

光锥AdS_5 \times S^5超弦的光谱包含由具有复动量的粒子组成的状态,特别是那些在去凝聚极限时转变为束缚态的粒子。我们提出了这些状态的镜像TBA描述。我们研究了一个三粒子态,它是一个基本粒子散射态和一个两粒子束缚态的有限尺寸表示,并且是一个来自N=4 SYM的su(2)扇区的算符的对偶。我们发现Y函数的解析行为与实动量态的解析行为有很大的不同。最重要的是,Y_Q函数在解析带中呈现极点,这导致在该态能量公式中出现新的项。此外,TBA方程由涉及Y_2的量子化条件提供。考虑另一个三粒子态的例子,我们发现相应的量子化条件甚至不涉及Y_1。我们的处理可以推广到广泛的一类具有复杂动量的状态。

英文摘要:

The spectrum of the light-cone AdS_5 \times S^5 superstring contains states composed of particles with complex momenta including in particular those which turn into bound states in the decompactification limit. We propose the mirror TBA description for these states. We focus on a three-particle state which is a finite-size representative of a scattering state of a fundamental particle and a two-particle bound state and dual to an operator from the su(2) sector of N=4 SYM. We find that the analytic behavior of Y-functions differs drastically from the case of states with real momenta. Most importantly, Y_Q-functions exhibit poles in the analyticity strip which leads to the appearance of new terms in the formula for the energy of this state. In addition, the TBA equations are supplied by quantization conditions which involve Y_2. Considering yet another example of a three-particle state, we find that the corresponding quantization conditions do not even involve Y_1. Our treatment can be generalized to a wide class of states with complex momenta.

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