Practical solution to the sign problem at finite theta-vacuum angle
Practical solution to the sign problem at finite theta-vacuum angle
复制标题
有限θ真空角符号问题的实用解决方案
DOI：
10.1103/physrevd.87.056003
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发表时间：
2013
影响因子：
5
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Takahiro Sasaki;et al.
本文利用Polyakov圈扩展的Nambu-Jona-Lasinio模型，研究了在格点QCD模拟中引入θ-真空项时如何避免符号问题。我们考虑了变换后QCD拉格朗日量的重加权方法。在拉格朗日量中，奇质量项作为符号问题的原因被最小化。为了在重加权方法中找到一个好的参考系，我们利用双味Polyakov环扩展Nambu-Jona-Lasinio模型来估计平均重加权因子，最终找到一个好的参考系。
We investigate a way of circumventing the sign problem in lattice QCD simulations with a theta-vacuum term, using the Polyakov-loop extended Nambu–Jona-Lasinio model. We consider the reweighting method for the QCD Lagrangian after thetransformation. In the Lagrangian, the-odd mass term as a cause of the sign problem is minimized. In order to find a good reference system in the reweighting method, we estimate the average reweighting factor by using the two-flavor Polyakov-loop extended Nambu–Jona-Lasinio model and eventually find a good reference system.