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arXiv 1305.3702hep-th
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有效粒子重整化群过程中的费米子质量混合和真空平凡性

Fermion mass mixing and vacuum triviality in the renormalization group procedure for effective particles

Stanislaw D. Glazek

摘要:

本文将有效粒子的重整化群方法应用于自由费米子的量子理论模型,在模型中加入了质量混合项形式的相互作用。如果使用基于动力学瞬时形式的标准方法,理论将受到真空问题的困扰,这是由真空中虚量子的发散产生引起的,它需要在量子化之前调整其自由度以适应增加的相互作用项,这被认为是避免量子真空问题的一种方法。在有效粒子方法中,量子真空问题是通过使用动力学的前沿形式来处理的,其中对的产生被动量守恒所排除。相应的哈密顿量包括通过约束方程的质量参数,而所需的量子场算符的构造独立于所有的质量参数,包括出现在添加的质量混合相互作用项的参数。然后,在非微扰计算结束时,物理费米子的质量和状态就出现了,而非微扰计算完全是在同一个相互作用量子理论中进行的,只有一个平凡的真空,没有量子化调整。由于前形式的7个运动学对称性(瞬时形式只有6个),费米子场所有动量模的重整化群方程的先验无限集合被简化为2 × 2质量平方矩阵的一个方程。对于强质量混合相互作用,费米子模型的解决方案定性地不同于类似的,早期发现的玻色子模型的解决方案的快子的情况下。

英文摘要:

Renormalization group procedure for effective particles is applied to the model quantum theory of free fermions to which one adds an interaction in the form of a mass mixing term. If one used a standard approach based on the instant form of dynamics, the theory would suffer from a generic vacuum problem caused by a divergent production of virtual quanta out of a bare vacuum and it would require an adjustment of its degrees of freedom to the added interaction term before quantization, considered a means of avoiding the quantum vacuum problem. In the effective particle approach, the quantum vacuum problem is dealt with instead by using the front form of dynamics, where the pair production is excluded by momentum conservation. The corresponding Hamiltonian includes mass parameters through constraint equations while the required quantum field operators are constructed independently of all mass parameters, including the parameters that appear in the added mass mixing interaction term. Then the masses and states of physical fermions emerge at an end of the non-perturbative calculation that is carried out entirely in one and the same interacting quantum theory with a trivial vacuum and no quantization adjustment. An a priori infinite set of renormalization group equations for all momentum modes of fermion fields is reduced to just one equation for a two-by-two mass squared matrix, thanks to 7 kinematical symmetries of the front form (the instant form has only 6). For strong mass mixing interactions, the fermion model solutions qualitatively differ from the analogous, earlier found boson model solutions by the absence of tachyons.

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