Bounded Imaginary Powers and H-Calculus of the Stokes Operator in Unbounded Domains

  • H. Abels
Part of the Progress in Nonlinear Differential Equations and Their Applications book series (PNLDE, volume 64)

Abstract

In the present contribution we study the Stokes operator A q = -P q Δ on Lσq (Ω), 1 < q < ∞, where Ω is a suitable bounded or unbounded domain in ℝn, n ≥ 2, with C1,1-boundary. We present some conditions on Ω and the related function spaces and basic equations which guarantee that c + A q for suitable c ∈ ℝ is of positive type and admits a bounded H- calculus. This implies the existence of bounded imaginary powers of c + A q . Most domains studied in the theory of Navier-Stokes like, e.g., bounded, exterior, and aperture domains as well as asymptotically flat layers satisfy the conditions. The proof is done by constructing an approximate resolvent based on the results of [3], which were obtained by applying the calculus of pseudodifferential boundary value problems. Finally, the result is used to proof the existence of a bounded H-calculus of the Stokes operator Aq on an aperture domain.

Keywords

Stokes equations exterior domains bounded imaginary powers H-calculus aperture domain 

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Copyright information

© Birkhäuser Verlag Basel/Switzerland 2005

Authors and Affiliations

  • H. Abels
    • 1
  1. 1.Max Planck Institute for Mathematics in the SciencesLeipzigGermany

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