Global existence for coupled Klein-Gordon equations with different speeds

Research output: Contribution to journalArticle


Consider, in dimension 3, a system of coupled Klein-Gordon equations with different speeds, and an arbitrary quadratic nonlinearity. We show, for data which are small, smooth, and localized, that a global solution exists, and that it scatters. The proof relies on the space-time resonance approach; it turns out that the resonant structure of this equation has features which were not studied before, but which are generic in some sense.

Original languageEnglish (US)
Pages (from-to)2463-2506
Number of pages44
JournalAnnales de l'Institut Fourier
Issue number6
StatePublished - Dec 1 2011



  • Global existence
  • Klein-Gordon
  • Resonances

ASJC Scopus subject areas

  • Algebra and Number Theory
  • Geometry and Topology

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