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Estimates on the solution of an elliptic equation related to Brownian motion with drift (II).

Joseph G. ConlonPeder A. Olsen — 1997

Revista Matemática Iberoamericana

In this paper we continue the study of the Dirichlet problem for an elliptic equation on a domain in R3 which was begun in [5]. For R > 0 let ΩR be the ball of radius R centered at the origin with boundary ∂Ω R. The Dirichlet problem we are concerned with is the following: (-Δ - b(x).∇) u(x) = f(x),   x ∈ Ω R, with zero boundary conditions ...

Estimates on the solution of an elliptic equation related to Brownian motion with drift.

Joseph G. ConlonJuan Redondo — 1995

Revista Matemática Iberoamericana

In this paper we are concerned with studying the Dirichlet problem for an elliptic equation on a domain in R3. For simplicity we shall assume that the domain is a ball ΩR of radius R. Thus: ΩR = {x ∈ R3 : |x| < R}. The equation we are concerned with is given by (-Δ - b(x).∇) u(x) = f(x),    x ∈ ΩR, with zero Dirichlet boundary conditions.

Fluctuations of brownian motion with drift.

Joseph G. ConlonPeder Olsen — 1999

Publicacions Matemàtiques

Consider 3-dimensional Brownian motion started on the unit sphere {|x| = 1} with initial density ρ. Let ρt be the first hitting density on the sphere {|x| = t + 1}, t > 0. Then the linear operators T defined by T ρ = ρ form a semigroup with an infinitesimal generator which is approximately the square root of the Laplacian. This paper studies the analogous situation for Brownian motion with a drift , where is small in a suitable scale invariant norm.

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