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arXiv 1104.1126hep-lat
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格点Wess-Zumino模型中的超导守恒

Supercurrent conservation in the lattice Wess-Zumino model with Ginsparg-Wilson fermions

Chen Chen, Joel Giedt, Joseph Paki

摘要:

我们研究了在晶格上建立的四维Wess-Zumino模型的超流守恒。这个公式已经被讨论过好几次了,它使用了重叠(Neuberger)簇的Ginsparg-Wilson费米子,加上一个辅助费米子(加上超伴子),使得U(1)_R对称性的晶格形式在裸质量消失的极限下精确地保持。我们表明,几乎天真的超电流是保守的一个循环。相反,我们发现,这是不正确的威尔逊费米子和一个典型的标量作用。我们在蒙特卡罗模拟中为超电流的非守恒性提供了非微扰证据。

英文摘要:

We study supercurrent conservation for the four-dimensional Wess-Zumino model formulated on the lattice. The formulation is one that has been discussed several times, and uses Ginsparg-Wilson fermions of the overlap (Neuberger) variety, together with an auxiliary fermion (plus superpartners), such that a lattice version of U(1)_R symmetry is exactly preserved in the limit of vanishing bare mass. We show that the almost naive supercurrent is conserved at one loop. By contrast we find that this is not true for Wilson fermions and a canonical scalar action. We provide nonperturbative evidence for the nonconservation of the supercurrent in Monte Carlo simulations.

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