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arXiv 0812.0677hep-lat
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全阶跳跃展开II的模拟:Wilson费米子

Simulating the All-Order Hopping Expansion II: Wilson Fermions

Ulli Wolff

摘要:

研究了外标量场中Wilson格点费米子的Prokof'ev-Svistunov蠕虫算法的推广.我们有效地模拟Monte Carlo图有助于跳跃扩展的两点函数在有限格上的任意顺序。对于恒定背景场i进行测试。e.一定质量的自由费米子对于这里介绍的方法,预计这将是一个代表性的情况。它的优点是我们知道确切的答案,因此可以对数字进行严格的测试。该方法是制定在两个和三个时空维度。在D=2时,Wilson费米子具有特殊的正性性质,模拟结果与伊辛模型相似.在D=3时,该方法也适用于足够大的质量,但在目前的公式中存在一个困难的符号问题,阻碍了我们采取连续极限。

英文摘要:

We investigate the extension of the Prokof'ev-Svistunov worm algorithm to Wilson lattice fermions in an external scalar field. We effectively simulate by Monte Carlo the graphs contributing to the hopping expansion of the two-point function on a finite lattice to arbitrary order. Tests are conducted for a constant background field i. e. free fermions at some mass. For the method introduced here this is expected to be a representative case. Its advantage is that we know the exact answers and can thus make stringent tests on the numerics. The approach is formulated in both two and three space-time dimensions. In D=2 Wilson fermions enjoy special positivity properties and the simulation is similarly efficient as in the Ising model. In D=3 the method also works at sufficiently large mass, but there is a hard sign problem in the present formulation hindering us to take the continuum limit.

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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