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arXiv 0902.3561math.PRmath-phmath.MP
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具有对数相互作用势的无穷维相互作用布朗运动

Interacting Brownian motions in infinite dimensions with logarithmic interaction potentials

Hirofumi Osada

摘要:

研究了由无穷多个布朗粒子在$\mathbb{R}^d$中运动并通过对数函数(二维库仑势)相互作用构成的扩散系统的构造。这些电位非常强,在自然界中作用范围很长。相关的平衡态不再是吉布斯测度。我们目前的一般结果的建设这样的扩散,并作为其应用,构建两个典型的相互作用布朗运动与对数相互作用势,即戴森模型在无限维和Ginibre相互作用布朗运动。前者是$\mathbb{R}$中的粒子系统,而后者是$\mathbb{R}^2$中的粒子系统。这两个模型在空间中是平移和旋转不变的,因此,分别是维度$d=1,2$的原型。前一种扩散模型的平衡态是具有正弦核的行列式或Pfronian随机点场。它们出现在高斯随机矩阵(如GOE、GUE和GSE)的系综谱的物理极限中。后一种扩散模型的平衡态是复杂的非厄米高斯随机矩阵的系综的谱的物理极限,称为Ginibre系综。

英文摘要:

We investigate the construction of diffusions consisting of infinitely numerous Brownian particles moving in $\mathbb{R}^d$ and interacting via logarithmic functions (two-dimensional Coulomb potentials). These potentials are very strong and act over a long range in nature. The associated equilibrium states are no longer Gibbs measures. We present general results for the construction of such diffusions and, as applications thereof, construct two typical interacting Brownian motions with logarithmic interaction potentials, namely the Dyson model in infinite dimensions and Ginibre interacting Brownian motions. The former is a particle system in $\mathbb{R}$, while the latter is in $\mathbb{R}^2$. Both models are translation and rotation invariant in space, and as such, are prototypes of dimensions $d=1,2$, respectively. The equilibrium states of the former diffusion model are determinantal or Pfaffian random point fields with sine kernels. They appear in the thermodynamical limits of the spectrum of the ensembles of Gaussian random matrices such as GOE, GUE and GSE. The equilibrium states of the latter diffusion model are the thermodynamical limits of the spectrum of the ensemble of complex non-Hermitian Gaussian random matrices known as the Ginibre ensemble.

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