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arXiv 0705.0871hep-th
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具有质量的非阿贝尔规范不变量action的么正性分析

Unitarity analysis of a non-Abelian gauge invariant action with a mass

David Dudal, Nele Vandersickel, Henri Verschelde

摘要:

在我们和同事以前的工作中,我们已经能够基于非定域规范不变的质量维2算符F1/D^2F构造一个带质量参数的定域非阿贝尔规范不变作用量。在线性协变规范类中,证明了所产生作用量的可重整化性到所有阶微扰理论。我们还讨论了当质量恒为零时,该模型与普通无质量杨-米尔斯规范理论的微扰等价性。此外,我们指出存在一个BRST对称性与相应的幂零电荷。本文研究了这种质量规范模型的么正性问题。首先,我们简要回顾了如何利用BRST荷讨论么正性。然后,我们对我们的行为的最一般版本进行了详细的研究,我们得出的结论是,该模型不是幺正的,因为我们无法以一致的方式从物理谱中删除所有的负范数态。

英文摘要:

In previous work done by us and coworkers, we have been able to construct a local, non-Abelian gauge invariant action with a mass parameter, based on the nonlocal gauge invariant mass dimension two operator F1/D^2F. The renormalizability of the resulting action was proven to all orders of perturbation theory, in the class of linear covariant gauges. We also discussed the perturbative equivalence of the model with ordinary massless Yang-Mills gauge theories when the mass is identically zero. Furthermore, we pointed out the existence of a BRST symmetry with corresponding nilpotent charge. In this paper, we study the issue of unitarity of this massive gauge model. Firstly, we provide a short review how to discuss the unitarity making use of the BRST charge. Afterwards we make a detailed study of the most general version of our action, and we come to the conclusion that the model is not unitary, as we are unable to remove all the negative norm states from the physical spectrum in a consistent way.

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