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arXiv 2005.11845math.PRmath-phmath.MP
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布朗环与Liouville随机曲面的中心荷

Brownian loops and the central charge of a Liouville random surface

Morris Ang, Minjae Park, Joshua Pfeffer, Scott Sheffield

摘要:

我们探讨了所谓的zeta正则行列式的Laplace-Beltrami算子在一个紧凑的表面上,有或没有边界的几何意义。我们将拉普拉斯行列式的$(-c/2)$次幂与表面上强度为$c$的布朗环汤的适当正则化分拆函数相关联。这意味着,在某种意义上,用强度为$c$的布朗环汤来装饰随机曲面,相当于用拉普拉斯行列式的$(-c/2)$次幂来加权曲面定律。接下来,我们介绍了一种正则化的刘维量子引力(LQG)表面(与一些物质中心电荷参数$\mathbf{c}$),以产生一个光滑的表面的方法。我们还证明,用拉普拉斯行列式的$( -\mathbf{c}'/ 2)$次幂来加权这个随机表面的定律,可以精确地将物质中心电荷从$\mathbf{c}$变为$\mathbf{c} + \mathbf{c}'$。与先前的结果一起,这提供了一种解释的LQG表面的物质中心电荷$\mathbf{c}$作为一个纯粹的LQG表面装饰的布朗环汤强度$\mathbf{c}$。基于这一思想,我们提出了几个开放的问题,随机平面映射及其连续类似物。尽管LQG的原始构造仅针对$\mathbf{c}\leq 1$进行了良好定义,但当使用$\mathbf{c}>1$时,某些构造和问题也是有意义的。

英文摘要:

We explore the geometric meaning of the so-called zeta-regularized determinant of the Laplace-Beltrami operator on a compact surface, with or without boundary. We relate the $(-c/2)$-th power of the determinant of the Laplacian to the appropriately regularized partition function of a Brownian loop soup of intensity $c$ on the surface. This means that, in a certain sense, decorating a random surface by a Brownian loop soup of intensity $c$ corresponds to weighting the law of the surface by the $(-c/2)$-th power of the determinant of the Laplacian. Next, we introduce a method of regularizing a Liouville quantum gravity (LQG) surface (with some matter central charge parameter $\mathbf{c}$) to produce a smooth surface. And we show that weighting the law of this random surface by the $( -\mathbf{c}'/ 2)$-th power of the Laplacian determinant has precisely the effect of changing the matter central charge from $\mathbf{c}$ to $\mathbf{c} + \mathbf{c}'$. Taken together with the earlier results, this provides a way of interpreting an LQG surface of matter central charge $\mathbf{c}$ as a pure LQG surface decorated by a Brownian loop soup of intensity $\mathbf{c}$. Building on this idea, we present several open problems about random planar maps and their continuum analogs. Although the original construction of LQG is well-defined only for $\mathbf{c}\leq 1$, some of the constructions and questions also make sense when $\mathbf{c}>1$.

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