New Trends in the Theory of Hyperbolic Equations

1. Front Matter

   Pages i-xiii

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2. Wave Maps and Ill-posedness of their Cauchy Problem

   • Piero D’Ancona, Vladimir Georgiev

   Pages 1-111

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3. On the Global Behavior of Classical Solutions to Coupled Systems of Semilinear Wave Equations

   • Hideo Kubo, Masahito Ohta

   Pages 113-211

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4. Decay and Global Existence for Nonlinear Wave Equations with Localized Dissipations in General Exterior Domains

   • Mitsuhiro Nakao

   Pages 213-299

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5. Global Existence in the Cauchy Problem for Nonlinear Wave Equations with Variable Speed of Propagation

   • Karen Yagdjian

   Pages 301-385

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6. On the Nonlinear Cauchy Problem

   • Massimo Cicognani, Luisa Zanghirati

   Pages 387-448

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7. Sharp Energy Estimates for a Class of Weakly Hyperbolic Operators

   • Michael Dreher, Ingo Witt

   Pages 449-511

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The present volume is dedicated to modern topics of the theory of hyperbolic equations such as evolution equations, multiple characteristics, propagation phenomena, global existence, influence of nonlinearities.
It is addressed to beginners as well as specialists in these fields. The contributions are to a large extent self-contained.
Key topics include:
- low regularity solutions to the local Cauchy problem associated with wave maps; local well-posedness, non-uniqueness and ill-posedness results are proved
- coupled systems of wave equations with different speeds of propagation; here pointwise decay estimates for solutions in spaces with hyperbolic weights come in
- damped wave equations in exterior domains; the energy method is combined with the geometry of the exterior domain; for the critical part of the boundary a restricted localized effective dissipation is employed
- the phenomenon of parametric resonance for wave map type equations; the influence of time-dependent oscillations on the existence of global small data solutions is studied - a unified approach to attack degenerate hyperbolic problems as weakly hyperbolic ones and Cauchy problems for strictly hyperbolic equations with non-Lipschitz coefficients
- weakly hyperbolic Cauchy problems with finite time degeneracy; the precise loss of regularity depending on the spatial variables is determined; the main step is to find the correct class of pseudodifferential symbols and to establish a calculus which contains a symmetrizer.

• Cauchy problem
• Hyperbolic equations
• Partial differential equations
• Wave equations
• differential equation
• hyperbolic equation
• partial differential equation
• wave equation

• Fakultät für Mathematik und Informatik Institut für Angewandte Analysis, TU Bergakademie Freiberg, Freiberg, Germany

  Michael Reissig

• Institut für Mathematik, Universität Potsdam, Potsdam, Germany

  Bert-Wolfgang Schulze

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