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arXiv 0909.1003math.CVmath-phmath.MP
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随机保形焊接

Random Conformal Weldings

K. Astala, P. Jones, A. Kupiainen, E. Saksman

摘要:

通过焊接单位圆上的随机同胚,构造了平面上共形不变的随机闭曲线族。利用$βX$的指数构造同胚,其中$X$是二维自由场在圆上的约束,参数$β$处于“高温”区$β<\sqrt 2$ .焊接问题通过研究具有随机复伸缩的非一致椭圆Beltrami方程来解决。对于存在的一种方法Lehto使用。这需要尖锐的概率估计来控制共形模的annuli和他们被证明是通过分解的自由领域作为一个独立的固定规模领域和控制的相关性的复杂的膨胀限制到各种规模的并矢细胞。对于唯一性,我们引用Jones和Smirnov关于Hölder曲线的共形可移除性的结果。我们推测,我们的曲线是局部相关的SLE $(κ)$的$κ<4$。

英文摘要:

We construct a conformally invariant random family of closed curves in the plane by welding of random homeomorphisms of the unit circle. The homeomorphism is constructed using the exponential of $βX$ where $X$ is the restriction of the two dimensional free field on the circle and the parameter $β$ is in the "high temperature" regime $β<\sqrt 2$. The welding problem is solved by studying a non-uniformly elliptic Beltrami equation with a random complex dilatation. For the existence a method of Lehto is used. This requires sharp probabilistic estimates to control conformal moduli of annuli and they are proven by decomposing the free field as a sum of independent fixed scale fields and controlling the correlations of the complex dilation restricted to dyadic cells of various scales. For uniqueness we invoke a result by Jones and Smirnov on conformal removability of Hölder curves. We conjecture that our curves are locally related to SLE$(κ)$ for $κ<4$.

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