35,909 research outputs found
Carleson Measures for the Drury-Arveson Hardy space and other Besov-Sobolev spaces on Complex Balls
We characterize the Carleson measures for the Drury-Arveson Hardy space and
other Hilbert spaces of analytic functions of several complex variables. This
provides sharp estimates for Drury's generalization of Von Neumann's
inequality. The characterization is in terms of a geometric condition, the
"split tree condition", which reflects the nonisotropic geometry underlying the
Drury-Arveson Hardy space
Hausdorff measure of arcs and Brownian motion on Brownian spatial trees
A Brownian spatial tree is defined to be a pair , where is the rooted real tree naturally associated with a Brownian excursion and φ is a random continuous function from into ℝd such that, conditional on , φ maps each arc of to the image of a Brownian motion path in ℝd run for a time equal to the arc length. It is shown that, in high dimensions, the Hausdorff measure of arcs can be used to define an intrinsic metric on the set . Applications of this result include the recovery of the spatial tree from the set alone, which implies in turn that a Dawson–Watanabe super-process can be recovered from its range. Furthermore, can be used to construct a Brownian motion on , which is proved to be the scaling limit of simple random walks on related discrete structures. In particular, a limiting result for the simple random walk on the branching random walk is obtained
Coalescent tree based functional representations for some Feynman-Kac particle models
We design a theoretic tree-based functional representation of a class of
Feynman-Kac particle distributions, including an extension of the Wick product
formula to interacting particle systems. These weak expansions rely on an
original combinatorial, and permutation group analysis of a special class of
forests. They provide refined non asymptotic propagation of chaos type
properties, as well as sharp \LL\_p-mean error bounds, and laws of large
numbers for -statistics. Applications to particle interpretations of the top
eigenvalues, and the ground states of Schr\"{o}dinger semigroups are also
discussed
First-order limits, an analytical perspective
In this paper we present a novel approach to graph (and structural) limits
based on model theory and analysis. The role of Stone and Gelfand dualities is
displayed prominently and leads to a general theory, which we believe is
naturally emerging. This approach covers all the particular examples of
structural convergence and it put the whole in new context. As an application,
it leads to new intermediate examples of structural convergence and to a "grand
conjecture" dealing with sparse graphs. We survey the recent developments
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