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arXiv 0912.2850hep-lathep-thmath-phmath.MP
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费米子交错格点上指数定理的理论基础

Theoretical foundation for the Index Theorem on the lattice with staggered fermions

David H. Adams

摘要:

本文提出了一种在连续极限之外识别交错格点费米子零模的方法。我们的方法也确定了这些模式的手征,和他们的指数被认为是由规范场拓扑结构根据指数定理。关键思想是考虑交错狄拉克算子的某个厄米版本的谱流。由此得到的交错费米子指数可作为格点规范场拓扑荷赋值的一种新方法。在二维U(1)背景下的数值研究中,发现它的性能与Wilson指数一样好,同时计算效率更高。它也可以表示为一个新的交错费米子核的重叠狄拉克算子的指数。

英文摘要:

A way to identify the would-be zero-modes of staggered lattice fermions away from the continuum limit is presented. Our approach also identifies the chiralities of these modes, and their index is seen to be determined by gauge field topology in accordance with the Index Theorem. The key idea is to consider the spectral flow of a certain hermitian version of the staggered Dirac operator. The staggered fermion index thus obtained can be used as a new way to assign the topological charge of lattice gauge fields. In a numerical study in U(1) backgrounds in 2 dimensions it is found to perform as well as the Wilson index while being computationally more efficient. It can also be expressed as the index of an overlap Dirac operator with a new staggered fermion kernel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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