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Conservativeness of non-symmetric diffusion processes generated by perturbed divergence forms

  • Masayoshi Takeda EMAIL logo und Gerald Trutnau
Veröffentlicht/Copyright: 25. Februar 2012
Forum Mathematicum
Aus der Zeitschrift Band 24 Heft 2

Abstract.

Let Ed, d2, be an unbounded domain that is either open or closed. If it is closed, we assume that the boundary is locally the boundary of an extension domain. We present conservativeness criteria for (possibly reflected) diffusions with state space E and generator L which in the interior of E is given in the following suggestive form:

Lf=12i,j=1dj(aijif)+i=1dBiif.

Here the diffusion matrix (aij) is allowed to be non-symmetric, is merely assumed to consist of measurable functions, and satisfies locally a strict ellipticity condition. Moreover, B=(B1,...,Bd) is a divergence free vector field that satisfies some sector condition. Our main tool is a recently extended forward and backward martingale decomposition, which reduces to the well-known Lyons–Zheng decomposition in the symmetric case.

Received: 2010-05-11
Revised: 2011-01-23
Published Online: 2012-02-25
Published in Print: 2012-March

© 2012 by Walter de Gruyter Berlin Boston

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