The Dirichlet problem for elliptic equations in divergence and nondivergence form with singular drift term

Details The Dirichlet problem for elliptic equations in divergence and nondivergence form with singular drift term The Dirichlet problem for elliptic equations in divergence and nondivergence form with singular drift term

2005-10-18

arxiv.org/abs/math/0510393v1

Mathematics

Analysis of PDEs

29 pages, 0 figures

Scientific paper

Given two elliptic operators L and M in nondivergence form, with coefficients A_L(x), A_M(x) and drift terms b_L(x), b_M(x), respectively, satisfying a Carleson measure disagreement condition in a Lipschitz domain Omega in R^{n+1}, then their harmonic measures are mutually absolutely continuous. As an application of this, a new approximation argument and known results we obtain necessary and sufficient conditions for a single operator L (in divergence or nondivergence form) to have regular harmonic measure with respect to Lebesgue measure. The results are sharp in all cases.

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