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arXiv 0712.2379hep-phhep-th
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Gribov拷贝与反常标度

Gribov copies and anomalous scaling

B. Holdom

摘要:

非微扰和格点方法表明,Gribov副本修改了规范理论的红外行为,并导致胶子传播的抑制。我们调查这是否可以在修改后的微扰理论。最小的修改收益通过一个非本地的推广Fadeev-Popov鬼,自动从物理状态。与Gribov副本相关的物理学的预期标度不变性导致出现一个非平凡的红外不动点。在一定的标度指数范围内,规范玻色子在红外线中表现出非粒子行为。量子色动力学的约束机制需要更大的标度指数,但是鬼效应的严重性会打乱振幅红外标度行为的朴素功率计数。

英文摘要:

Nonperturbative and lattice methods indicate that Gribov copies modify the infrared behavior of gauge theories and cause a suppression of gluon propagation. We investigate whether this can be implemented in a modified perturbation theory. The minimal modification proceeds via a nonlocal generalization of the Fadeev-Popov ghost that automatically decouples from physical states. The expected scale invariance of the physics associated with Gribov copies leads to the emergence of a nontrivial infrared fixed point. For a range of a scaling exponent the gauge bosons exhibit unparticlelike behavior in the infrared. The confining regime of interest for QCD requires a larger scaling exponent, but then the severity of ghost dominance upsets naive power counting for the infrared scaling behavior of amplitudes.

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