One-dimensional QCD in thimble regularization

One-dimensional QCD in thimble regularization
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顶针正则化中的一维 QCD

DOI:
10.1103/physrevd.97.014503
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发表时间:
2017
期刊:
影响因子:
5
通讯作者:
G. Eruzzi
G. Eruzzi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
F. Renzo;G. Eruzzi

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0+1 维的 QCD 通过顶针正则化进行数值求解。在这个玩具模型的背景下,提出了 SU(N) 理论的一般形式主义。该理论所展示的符号问题是一个真正的问题,源于(夸克)化学势。原始(实)积分域中存在三个驻点,因此要考虑与它们相关的所有顶针的贡献:我们展示了半经典计算如何为参数空间区域提供提示,这在这方面是绝对至关重要的。正确地再现了手性凝聚体和波利亚科夫环的已知分析结果:这在味道数量 N_f 的高值时尤其微不足道。在这种情况下,我们注意到发生了单顶针主导场景(主导顶针是与身份相关的顶针)。 N_f 值较低时,计算可能会更加困难。需要强调的是,这根本不是原始符号问题的结果(甚至不是通过剩余阶段)。后者始终受到控制,而来自不同顶针的贡献的意外、微妙的取消可以在参数空间的(受限)区域中到位。
QCD in 0+1 dimensions is numerically solved via thimble regularization. In the context of this toy model, a general formalism is presented for SU(N) theories. The sign problem that the theory displays is a genuine one, stemming from a (quark) chemical potential. Three stationary points are present in the original (real) domain of integration, so that contributions from all the thimbles associated to them are to be taken into account: we show how semiclassical computations can provide hints on the regions of parameter space where this is absolutely crucial. Known analytical results for the chiral condensate and the Polyakov loop are correctly reproduced: this is in particular trivial at high values of the number of flavors N_f. In this regime we notice that the single thimble dominance scenario takes place (the dominant thimble is the one associated to the identity). At low values of N_f computations can be more difficult. It is important to stress that this is not at all a consequence of the original sign problem (not even via the residual phase). The latter is always under control, while accidental, delicate cancelations of contributions coming from different thimbles can be in place in (restricted) regions of the parameter space.
重密 QCD 中符号问题的剖析
DOI: 10.1140/epjc/s10052-016-4412-2
发表时间: 2016
期刊: The European Physical Journal C
影响因子: --
作者:
Garron N
通讯作者: Garron N
复杂朗之万动力学中的简并分布:有限化学势下的一维 QCD
DOI: 10.1007/jhep08(2010)017
发表时间: 2010
影响因子: 5.4
作者:
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通讯作者: Aarts G