KPZ in one dimensional random geometry of multiplicative cascades

Details KPZ in one dimensional random geometry of multiplicative cascades KPZ in one dimensional random geometry of multiplicative cascades

2008-06-08

arxiv.org/abs/0806.1347v1

Mathematics

Probability

14 pages

Scientific paper

10.1007/s00220-009-0752-1

We prove a formula relating the Hausdorff dimension of a subset of the unit interval and the Hausdorff dimension of the same set with respect to a random path matric on the interval, which is generated using a multiplicative cascade. When the random variables generating the cascade are exponentials of Gaussians, the well known KPZ formula of Knizhnik, Polyakov and Zamolodchikov from quantum gravity appears. This note was inspired by the recent work of Duplantier and Sheffield proving a somewhat different version of the KPZ formula for Liouville gravity. In contrast with the Liouville gravity setting, the one dimensional multiplicative cascade framework facilitates the determination of the Hausdorff dimension, rather than some expected box count dimension.

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