One-dimensional QCD in thimble regularization
One-dimensional QCD in thimble regularization
复制标题
顶针正则化中的一维 QCD
DOI:
10.1103/physrevd.97.014503
复制
发表时间:
2017
影响因子:
5
通讯作者:
G. Eruzzi
中科院分区:
文献类型:
--
作者:
F. Renzo;G. Eruzzi
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.
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
影响因子:
5.4
作者:
Aarts G
通讯作者:
Aarts G