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During the of Fall 1991, The Centre de Recerca Matematica, a research institute sponsored by the Institut d'Estudis Catalans, devoted a quarter to the study of stochastic analysis. Prominent workers in this field visited the Center from all over the world for periods ranging from a few days to several weeks. To take advantage of the presence in Barcelona of so many special- ists in stochastic analysis, we organized a workshop on the subject in Sant Feliu de Guixols (Girona) that provided an opportunity for them to ex- change information and ideas about their current work. Topics discussed...

The authors consider a $d$-dimensional random field $u = {u(t,x)}$ that solves a non-linear system of stochastic wave equations in spatial dimensions $k in {1,2,3}$, driven by a spatially homogeneous Gaussian noise that is white in time. They mainly consider the case where the spatial covariance is given by a Riesz kernel with exponent $eta$. Using Malliavin calculus, they establish upper and lower bounds on the probabilities that the random field visits a deterministic subset of $mathbb^d$, in terms, respectively, of Hausdorff measure and Newtonian capacity of this set. The dimension...