Complex Langevin dynamics in the SU(3) spin model at nonzero chemical potential revisited
Complex Langevin dynamics in the SU(3) spin model at nonzero chemical potential revisited
复制标题
重新审视非零化学势下 SU(3) 自旋模型中的复杂 Langevin 动力学
DOI:
10.1007/jhep01(2012)118
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发表时间:
2012
影响因子:
5.4
通讯作者:
Aarts G
中科院分区:
文献类型:
--
作者:
Aarts G
The three-dimensional SU (3) spin model is an effective Polyakov loop model for QCD at nonzero temperature and density. It suffers from a sign problem at nonzero chemical potential. We revisit this model using complex Langevin dynamics and assess in particular the justification of this approach, using analyticity at small μ 2 and the criteria for correctness developed recently. Finite-stepsize effects are discussed in some detail and a higher-order algorithm is employed to eliminate leading stepsize corrections. Our results strongly indicate that complex Langevin dynamics is reliable in this theory in both phases, including the critical region. This is in sharp contrast to the case of the XY model, where correct results were obtained in only part of the phase diagram.
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