Two-dimensional Markovian holonomy fields

Details Two-dimensional Markovian holonomy fields Two-dimensional Markovian holonomy fields

2008-04-14

arxiv.org/abs/0804.2230v1

Mathematics

Probability

Scientific paper

We define a notion of Markov process indexed by curves drawn on a compact surface and taking its values in a compact Lie group. We call such a process a two-dimensional Markovian holonomy field. The prototype of this class of processes, and the only one to have been constructed before the present work, is the canonical process under the Yang-Mills measure, first defined by Ambar Sengupta and later by the author . The Yang-Mills measure sits in the class of Markovian holonomy fields very much like the Brownian motion in the class of Levy processes. We prove that every regular Markovian holonomy field determines a Levy process of a certain class on the Lie group in which it takes its values, and construct, for each Levy process in this class, a Markovian holonomy field to which it is associated. When the Lie group is in fact a finite group, we give an alternative construction of this Markovian holonomy field as the monodromy of a random ramified principal bundle.

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