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arXiv 1706.01079math.PR
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具有尺度相关方差的离散二维高斯自由场的Gibbs测度几何

Geometry of the Gibbs measure for the discrete 2D Gaussian free field with scale-dependent variance

Frédéric Ouimet

摘要:

我们继续研究Arguin和Ouimet(2016)中介绍的尺度非均匀高斯自由场。首先,我们计算V_N上的极限自由能,并采用Bovier和Kurkova(2004 b)的技术来确定极限两重叠分布。这种适应已经成功地应用于Arguin和Zindy(2015)的更简单的情况,其中计算了具有两个能级(在V_N的中心)的场的极限自由能,并且在均匀情况下确定了极限两重叠分布。我们的结果与广义随机能量模型(GREM)的类似量一致;分别参见Capocaccia et al.(1987)和Bovier and Kurkova(2004 a)。其次,我们证明了推广的Ghirlanda-Guerra恒等式在极限下是完全成立的。作为一个推论,重叠的极限阵列是超度量的,极限吉布斯测度具有与Ruelle概率级联相同的定律。

英文摘要:

We continue our study of the scale-inhomogeneous Gaussian free field introduced in Arguin and Ouimet (2016). Firstly, we compute the limiting free energy on V_N and adapt a technique of Bovier and Kurkova (2004b) to determine the limiting two-overlap distribution. The adaptation was already successfully applied in the simpler case of Arguin and Zindy (2015), where the limiting free energy was computed for the field with two levels (in the center of V_N) and the limiting two-overlap distribution was determined in the homogeneous case. Our results agree with the analogous quantities for the Generalized Random Energy Model (GREM); see Capocaccia et al. (1987) and Bovier and Kurkova (2004a), respectively. Secondly, we show that the extended Ghirlanda-Guerra identities hold exactly in the limit. As a corollary, the limiting array of overlaps is ultrametric and the limiting Gibbs measure has the same law as a Ruelle probability cascade.

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