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arXiv 1301.2876math.PRmath-phmath.MP
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刘维布朗运动

Liouville Brownian motion

Christophe Garban, Rémi Rhodes, Vincent Vargas

摘要:

我们构造了一个随机过程,称为刘维布朗运动,这是布朗运动与度量$e^{γX(z)}\,dz^2$,$γ<γ_c=2$和$X$是一个高斯自由场。这样一个过程被证明与随机游动在大平面地图上的标度极限有关,最终由统计物理模型加权,该模型以共形的方式嵌入在欧几里得平面或球面中。该构造相当于根据Liouville测度“$M_γ(dz)=e^{γX(z)}\,dz$“的局部行为来改变标准二维布朗运动$B_t$的速度。证明了对所有的$γ<γ_c=2$,相应的Markov过程都是Feller扩散,且对所有的$γ<γ_c$,Liouville测度$M_γ$在$P_{\mathbf{t}}$下不变.这一刘维尔布朗运动使我们能够在刘维尔量子引力中引入一整套随机分析工具,这将有望对刘维尔量子引力的几何分析有所帮助。

英文摘要:

We construct a stochastic process, called the Liouville Brownian motion, which is the Brownian motion associated to the metric $e^{γX(z)}\,dz^2$, $γ<γ_c=2$ and $X$ is a Gaussian Free Field. Such a process is conjectured to be related to the scaling limit of random walks on large planar maps eventually weighted by a model of statistical physics which are embedded in the Euclidean plane or in the sphere in a conformal manner. The construction amounts to changing the speed of a standard two-dimensional Brownian motion $B_t$ depending on the local behavior of the Liouville measure "$M_γ(dz)=e^{γX(z)}\,dz$". We prove that the associated Markov process is a Feller diffusion for all $γ<γ_c=2$ and that for all $γ<γ_c$, the Liouville measure $M_γ$ is invariant under $P_{\mathbf{t}}$. This Liouville Brownian motion enables us to introduce a whole set of tools of stochastic analysis in Liouville quantum gravity, which will be hopefully useful in analyzing the geometry of Liouville quantum gravity.

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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