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arXiv 0907.4609hep-phhep-lat
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重整化威尔逊圈的零点能

Zero Point Energy of Renormalized Wilson Loops

Yoshimasa Hidaka, Robert D. Pisarski

摘要:

夸克反夸克势和它的零点能可以从威尔逊圈的晶格测量中提取出来。我们讨论了一个独特的处方重整化的威尔逊圈,为零点能量的微扰的贡献消失相同。零点能量可以非微扰地产生,我们通过考虑有效弦模型来说明。在Nambu模型中,非微扰对零点能量的贡献为零,但当包含非本征曲率项时,非微扰贡献为非零。在一个回路阶,非微扰对零点能量的贡献是负的,与非本征曲率项的符号无关。

英文摘要:

The quark antiquark potential, and its associated zero point energy, can be extracted from lattice measurements of the Wilson loop. We discuss a unique prescription to renormalize the Wilson loop, for which the perturbative contribution to the zero point energy vanishes identically. A zero point energy can arise nonperturbatively, which we illustrate by considering effective string models. The nonperturbative contribution to the zero point energy vanishes in the Nambu model, but is nonzero when terms for extrinsic curvature are included. At one loop order, the nonperturbative contribution to the zero point energy is negative, regardless of the sign of the extrinsic curvature term.

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