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Extending the Wong-Zakai theorem to reversible Markov processes

Richard F. Bass, B. Hambly, Terry Lyons (2002)

Journal of the European Mathematical Society

We show how to construct a canonical choice of stochastic area for paths of reversible Markov processes satisfying a weak Hölder condition, and hence demonstrate that the sample paths of such processes are rough paths in the sense of Lyons. We further prove that certain polygonal approximations to these paths and their areas converge in p -variation norm. As a corollary of this result and standard properties of rough paths, we are able to provide a significant generalization of the classical result...

Extremal points of high-dimensional random walks and mixing times of a brownian motion on the sphere

Ronen Eldan (2014)

Annales de l'I.H.P. Probabilités et statistiques

We derive asymptotics for the probability that the origin is an extremal point of a random walk in n . We show that in order for the probability to be roughly 1 / 2 , the number of steps of the random walk should be between e n / ( C log n ) and e C n log n for some constant C g t ; 0 . As a result, we attain a bound for the π 2 -covering time of a spherical Brownian motion.

Extremal problems for conditioned brownian motion and the hyperbolic metric

Rodrigo Bañuelos, Tom Carroll (2000)

Annales de l'institut Fourier

This paper investigates isoperimetric-type inequalities for conditioned Brownian motion and their generalizations in terms of the hyperbolic metric. In particular, a generalization of an inequality of P. Griffin, T. McConnell and G. Verchota, concerning extremals for the lifetime of conditioned Brownian motion in simply connected domains, is proved. The corresponding lower bound inequality is formulated in various equivalent forms and a special case of these is proved.

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