An Xin, Başar Gökçe, Stephanov Mikhail, Yee Ho-Ung
Department of Physics, University of Illinois, Chicago, Illinois 60607, USA.
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Phys Rev Lett. 2021 Aug 13;127(7):072301. doi: 10.1103/PhysRevLett.127.072301.
In the context of the search for the QCD critical point using non-Gaussian fluctuations, we obtain the evolution equations for non-Gaussian cumulants to the leading order of the systematic expansion in the magnitude of thermal fluctuations. We develop a diagrammatic technique in which the leading order contributions are given by tree diagrams. We introduce a Wigner transform for multipoint correlators and derive the evolution equations for three- and four-point Wigner functions for the problem of nonlinear stochastic diffusion with multiplicative noise.
在利用非高斯涨落寻找量子色动力学临界点的背景下，我们得到了非高斯累积量的演化方程，其精度达到热涨落幅度系统展开的主导阶。我们发展了一种图解技术，其中主导阶贡献由树图给出。我们为多点关联函数引入了维格纳变换，并推导了具有乘性噪声的非线性随机扩散问题的三点和四点维格纳函数的演化方程。
