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arXiv 1104.0213hep-lat
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无符号问题格点上超对称模型的模拟

Simulation of supersymmetric models on the lattice without a sign problem

David Baumgartner, Urs Wenger

摘要:

在具有(自发)破缺超对称性的晶格上模拟超对称模型时,会遇到与Witten指数消失有关的费米子符号问题。我们提出了一种新的方法,它解决了这个问题,在低维制定的路径积分的费米子环方面的晶格。该配方是基于精确的跳跃展开的费米子行动,并允许明确的分解的配分函数玻色子和费米子的贡献。我们设计了一个模拟算法,分别采样的费米和玻色子部门,以及它们之间的相对概率。后者则允许直接计算Witten指数和相应的Goldstino模式。最后,我们给出了N = 2超对称量子力学的光谱和Witten指数的晶格模拟结果。

英文摘要:

Simulations of supersymmetric models on the lattice with (spontaneously) broken supersymmetry suffer from a fermion sign problem related to the vanishing of the Witten index. We propose a novel approach which solves this problem in low dimensions by formulating the path integral on the lattice in terms of fermion loops. The formulation is based on the exact hopping expansion of the fermionic action and allows the explicit decomposition of the partition function into bosonic and fermionic contributions. We devise a simulation algorithm which separately samples the fermionic and bosonic sectors, as well as the relative probabilities between them. The latter then allows a direct calculation of the Witten index and the corresponding Goldstino mode. Finally, we present results from simulations on the lattice for the spectrum and the Witten index for N=2 supersymmetric quantum mechanics.

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