用重新加权的三叶草费米子计算Epperian区
Epsilon regime calculations with reweighted clover fermions
摘要：
我们在小夸克质量下进行全动力学模拟，通过重新加权夸克质量，随机计算权重因子。这种方法避免了与直接模拟相关的一些技术困难。我们发现，权重因子的波动只有适度的nHYP涂抹动力学威尔逊三叶草合奏，并表明，原始和重新加权配置之间的重叠是大的短距离和长距离的观测。我们成功地将16^4，（1.85fm）^4体积组态从m_q 20 MeV重加权到m_q~5 MeV，将24^4，（2.77fm）^4组态从m_q~ 8 MeV重加权到m_q~MeV夸克质量，达到了ε区。利用赝标量和轴向矢量算符，我们预测了低能常数σ和F，并研究了它们的体积和质量依赖性。
英文摘要：
We perform fully dynamical simulations at small quark masses by reweighting in the quark mass, calculating the weight factors stochastically. This approach avoids some of the technical difficulties associated with direct simulations. We find that the weight factors fluctuate only moderately on nHYP smeared dynamical Wilson-clover ensembles, and demonstrate that the overlap between the original and reweighted configurations is large both for short and long distance observables. We could successfully reweight 16^4, (1.85fm)^4 volume configurations from m_q 20 MeV to m_q~5 MeV, and 24^4, (2.77fm)^4 configurations from m_q~8MeV to m_q~MeV quark masses, reaching the epsilon-regime. Using the pseudoscalar and axialvector correlators we predict the low energy constants Sigma and F and study their volume and mass dependence.
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