利用同位旋化学势重加权探索QCD相图

B. Brandt, F. Cuteri, G. Endrődi, S. Schmalzbauer
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引用次数: 7

摘要

我们从非零同位旋化学势的模拟中研究了重子和奇异夸克化学势的小值QCD相图。在纯同位旋化学势下的模拟不受符号问题的阻碍,在足够大的同位旋化学势下可以观察到介子凝聚。通过对夸克化学势的重加权,研究了相关相边界在重子和奇异化学势下的演化过程,并对结果进行了讨论。此外,我们提出并实现了一种替代方法来接近非零重子(和奇异夸克)化学势。这种方法包括模拟物理夸克与辅助夸克在非物理“同位旋”双重态中的配对,以及通过质量重加权使辅助夸克解耦。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the QCD phase diagram via reweighting from isospin chemical potential
We investigate the QCD phase diagram for small values of baryon and strange quark chemical potentials from simulations at non-zero isospin chemical potential. Simulations at pure isospin chemical potential are not hindered by the sign problem and pion condensation can be observed for sufficiently large isospin chemical potentials. We study how the related phase boundary evolves with baryonic and strange chemical potentials via reweighting in quark chemical potentials and discuss our results. Furthermore, we propose and implement an alternative method to approach nonzero baryon (and strange quark) chemical potentials. This method involves simulations where physical quarks are paired with auxiliary quarks in unphysical "isospin" doublets and a decoupling of the auxiliary quarks by mass reweighting.
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