Let Ω be an exterior domain in ℝn. It is shown that Ornstein-Uhlenbeck operators L generate C0-semigroups on L p (Ω) for p ∈ (1,∞) provided ∂Ω is smooth. The method presented also allows to determine the domain D(L) of L and to prove Lp-Lq smoothing properties of etL . If ∂Ω is only Lipschitz, results of this type are shown to be true for p close to 2.
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