Tempered transitions between thimbles

Tempered transitions between thimbles
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顶针之间的缓和过渡

DOI:
10.1103/physrevd.96.034513
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发表时间:
2017
期刊:
arXiv: High Energy Physics - Lattice
影响因子:
--
通讯作者:
N. Warrington
N. Warrington
中科院分区:
--
文献类型:
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作者:
A. Alexandru;G. Basar;P. Bedaque;N. Warrington

文献摘要

被引文献

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由于符号问题而无法使用重要性采样来研究具有复杂动作的量子场理论。一种可能的解决方案是使用全体形态梯度流,这是我们引入的一种与Lefschetz Thimbles想法相关的方法。在许多情况下,该方法生成的概率分布是多模式和标准的蒙特卡洛抽样失败。我们提出了一种算法,该算法结合了纠正的建议来解决此问题。我们将此算法应用于有限密度的0+1尺寸扭转模型,用于参数集,其中标准采样失败并表明该问题可以解决此问题。
Quantum field theories with complex actions cannot be investigated using importance sampling due to the sign problem. One possible solution is to use the holomorphic gradient flow, a method we introduced related to the Lefschetz thimbles idea. In many cases the probability distribution generated by this method is multi-modal and standard Monte-Carlo sampling fails. We propose an algorithm that incorporates tempered proposals to solve this problem. We apply this algorithm to the 0+1 dimensional Thirring model at finite density for a parameter set where standard sampling fails and show that tempered proposals cure this problem.