Abstract
Stochastic partial differential equations of the form ∂A=ξ are studied in four dimensions, with ξ a quaternionic white noise or Poisson random field. It is shown that solutions are euclidean Markov fields. This gives besides a new construction of free electromagnetic fields, also a large class of non-gaussian euclidean Markov random fields which give rise to solutions of the ultraviolet problem for self-interacting local fields in four space-time dimensions.
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