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arXiv 0901.1571cond-mat.stat-mechhep-th
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伊辛场论中的形状因子微扰展开和禁闭

Formfactor perturbation expansions and confinement in the Ising field theory

S. B. Rutkevich

摘要:

本文研究了二维铁磁伊辛场论在弱外磁场h中的粒子谱M_n(h)。根据Wu和McCoy的弱约束方案,在小的h>0时,费米子(畴壁)对被耦合成玻色子扭结-反扭结束缚态。含有两个以上费米子的涨落对复合粒子的波函数也有贡献,从而导致对复合粒子质量Mn(h)的高阶多费米子修正。我们描述了一个微扰的过程,它允许帐户多费米子波动,和费米子之间的长程约束相互作用,并导致模型的重整化参数的形状因子展开。我们得到了由Bethe-Salpeter方程核正则修正引起的质量M_n(h)的三阶多费米子修正的积分表示。

英文摘要:

We study the particle spectrum M_n(h) in the two-dimensional ferromagnetic Ising field theory in a weak external magnetic field h. According to Wu and McCoy scenario of the weak confinement, pairs of fermions (domain walls) are coupled into bosonic kink-antikink bound states at small h>0. Fluctuations with more than two fermions also contribute to the wave functions of the compound particles, leading to the multi-fermion corrections to their masses M_n(h) in higher orders in h. We describe a perturbative procedure, which allows to account both multi-fermion fluctuations, and the long-range confining interaction between fermions, and leads to the formfactor expansions for the renormalized parameters of the model. We obtain integral representations for the third-order multi-fermion correction to the mass M_n(h), which arise from the regular correction to the kernel of the Bethe-Salpeter equation.

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