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arXiv 0903.3173hep-th
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有效Action中的非二次规范固定和整体规范不变性

Non-Quadratic Gauge Fixing and Global Gauge Invariance in the Effective Action

F. T. Brandt, D. G. C. McKeon

摘要:

在有效拉格朗日量中有一个非二次表达式的规范固定项的可能性已经在自旋2理论中进行了探索,以便有一个既无迹又横向的传播子。我们首先展示了如何在自发破缺规范理论中使用同样的方法作为替代的't Hooft规范固定,它避免了在标量场中的二次项。这种“非二次”规范固定在有效作用量中导致存在两个复费米子虚场和一个实玻色子虚场。一个涉及费米规范参数的全局规范不变性,类似于通常的BRST不变性,存在于这个有效的行动。

英文摘要:

The possibility of having a gauge fixing term in the effective Lagrangian that is not a quadratic expression has been explored in spin-two theories so as to have a propagator that is both traceless and transverse. We first show how this same approach can be used in spontaneously broken gauge theories as an alternate to the 't Hooft gauge fixing which avoids terms quadratic in the scalar fields. This "non-quadratic" gauge fixing in the effective action results in there being two complex Fermionic and one real Bosonic ghost fields. A global gauge invariance involving a Fermionic gauge parameter, analogous to the usual BRST invariance, is present in this effective action.

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