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Maximal L p -regularity for Parabolic Equations, Fourier Multiplier Theorems and \(H^\infty\)-functional Calculus

Part of the Lecture Notes in Mathematics book series (LNM,volume 1855)

Abstract

In these lecture notes we report on recent breakthroughs in the functional analytic approach to maximal regularity for parabolic evolution equations, which set off a wave of activity in the last years and allowed to establish maximal L p -regularity for large classes of classical partial differential operators and systems.

In the first chapter (Sections 2-8) we concentrate on the singular integral approach to maximal regularity. In particular we present effective Mihlin multiplier theorems for operator-valued multiplier functions in UMD-spaces as an interesting blend of ideas from the geometry of Banach spaces and harmonic analysis with R-boundedness at its center. As a corollary of this result we obtain a characterization of maximal regularity in terms of R-boundedness. We also show how the multiplier theorems “bootstrap” to give the R-boundedness of large classes of classical operators. Then we apply the theory to systems of elliptic differential operators on \(\mathbb{R}^n\) or with some common boundary conditions and to elliptic operators in divergence form.

In Chapter II (Sections 9-15) we construct the \(H^\infty\)-calculus, give various characterizations for its boundedness, and explain its connection with the “operator-sum” method and R-boundedness. In particular, we extend McIntosh’s square function method form the Hilbert space to the Banach space setting. With this tool we prove, e.g., a theorem on the closedness of sums of operators which is general enough to yield the characterization theorem of maximal L p -regularity. We also prove perturbation theorems that allow us to show boundedness of the \(H^\infty\)-calculus for various classes of differential operators we studied before. In an appendix we provide the necessary background on fractional powers of sectorial operators.

Mathematics Subject Classification (2000):

  • 34Gxx
  • 34K30
  • 35K90
  • 42A45
  • 47Axx
  • 47D06
  • 47D07
  • 49J20
  • 60J25
  • 93B28

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Correspondence to Peer C. Kunstmann .

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© 2004 Springer-Verlag Berlin/Heidelberg

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Kunstmann, P.C., Weis, L. (2004). Maximal L p -regularity for Parabolic Equations, Fourier Multiplier Theorems and \(H^\infty\)-functional Calculus. In: Iannelli, M., Nagel, R., Piazzera, S. (eds) Functional Analytic Methods for Evolution Equations. Lecture Notes in Mathematics, vol 1855. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-44653-8_2

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  • DOI: https://doi.org/10.1007/978-3-540-44653-8_2

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-23030-4

  • Online ISBN: 978-3-540-44653-8

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