Ellipticity and Ergodicity

Details Ellipticity and Ergodicity Ellipticity and Ergodicity

2008-02-20

arxiv.org/abs/0802.2743v2

Mathematics

Analysis of PDEs

8 pages--Replacement, with corrections, of an earlier version

Scientific paper

Let $S=\{S_t\}_{t\geq0}$ be the submarkovian semigroup on $L_2(\Ri^d)$ generated by a self-adjoint, second-order, divergence-form, elliptic operator $H$ with Lipschitz continuous coefficients $c_{ij}$. Further let $\Omega$ be an open subset of $\Ri^d$. Under the assumption that $C_c^\infty(\Ri^d)$ is a core for $H$ we prove that $S$ leaves $L_2(\Omega)$ invariant if, and only if, it is invariant under the flows generated by the vector fields $Y_i=\sum^d_{j=1}c_{ij}\partial_j$.

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