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arXiv 1302.6050math.PRmath-phmath.MP
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关于Liouville布朗运动的热核和Dirichlet形式

On the heat kernel and the Dirichlet form of Liouville Brownian Motion

Christophe Garban, Rémi Rhodes, Vincent Vargas

摘要:

在\cite{GRV}中,引入了一种称为$\R^2$上的Liouville布朗运动的Feller过程.它可以被看作是一个布朗运动在一个随机几何中的演化,这个随机几何由(大质量)高斯自由场$e^{γX}$的指数形式给出,并且是关于2d-Liouville量子引力的正确的扩散过程。在本说明中,我们讨论了相关的狄利克雷形式的建设,基本上\cite{fuku}和技术介绍\cite{GRV}。然后对刘维尔预解式进行了分析。特别是,我们证明了它是强费勒,从而获得的刘维尔热核的存在通过一个非平凡的定理福岛和人的动机之一,导致引入刘维尔布朗运动在\cite{GRV}是调查令人困惑的刘维尔度量通过眼睛这个新的随机过程。一种可能的方法是使用例如在\cite{stollmann,sturm1,sturm2}中开发的理论,其目的是从存在于该空间上的过程的狄利克雷形式中捕获底层空间的“几何”。更确切地说,在一些温和的假设下的规则性的狄利克雷形式,他们提供了一个内在的度量,这是解释为一个扩展的黎曼几何适用于非微分结构。我们证明,所需的温和的假设得到满足,但相关的内在度量不幸消失,从而表明重正化理论仍然遥不可及的度量方面的狄利克雷形式。

英文摘要:

In \cite{GRV}, a Feller process called Liouville Brownian motion on $\R^2$ has been introduced. It can be seen as a Brownian motion evolving in a random geometry given formally by the exponential of a (massive) Gaussian Free Field $e^{γX}$ and is the right diffusion process to consider regarding 2d-Liouville quantum gravity. In this note, we discuss the construction of the associated Dirichlet form, following essentially \cite{fuku} and the techniques introduced in \cite{GRV}. Then we carry out the analysis of the Liouville resolvent. In particular, we prove that it is strong Feller, thus obtaining the existence of the Liouville heat kernel via a non-trivial theorem of Fukushima and al. One of the motivations which led to introduce the Liouville Brownian motion in \cite{GRV} was to investigate the puzzling Liouville metric through the eyes of this new stochastic process. One possible approach was to use the theory developed for example in \cite{stollmann,sturm1,sturm2}, whose aim is to capture the "geometry" of the underlying space out of the Dirichlet form of a process living on that space. More precisely, under some mild hypothesis on the regularity of the Dirichlet form, they provide an intrinsic metric which is interpreted as an extension of Riemannian geometry applicable to non differential structures. We prove that the needed mild hypotheses are satisfied but that the associated intrinsic metric unfortunately vanishes, thus showing that renormalization theory remains out of reach of the metric aspect of Dirichlet forms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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