The saddle-node of nearly homogeneous wave trains in reaction-diffusion systems

Jens D.M. Rademacher, Arnd Scheel

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15 Scopus citations


We study the saddle-node bifurcation of a spatially homogeneous oscillation in a reaction-diffusion system posed on the real line. Beyond the stability of the primary homogeneous oscillations created in the bifurcation, we investigate existence and stability of wave trains with large wavelength that accompany the homogeneous oscillation. We find two different scenarios of possible bifurcation diagrams which we refer to as elliptic and hyperbolic. In both cases, we find all bifurcating wave trains and determine their stability on the unbounded real line. We confirm that the accompanying wave trains undergo a saddle-node bifurcation parallel to the saddle-node of the homogeneous oscillation, and we also show that the wave trains necessarily undergo sideband instabilities prior to the saddle-node.

Original languageEnglish (US)
Pages (from-to)479-496
Number of pages18
JournalJournal of Dynamics and Differential Equations
Issue number2
StatePublished - Jun 2007

Bibliographical note

Funding Information:
This work was partially supported by the National Science Foundation through grant NSF DMS-0504271 (A. S.), and the Priority Program SPP 1095 of the German Research Foundation (J. R.). The authors are grateful to the referee for careful reading of the manuscript and many helpful suggestions.


  • Homogeneous oscillation
  • Reaction diffusion systems
  • Saddle-node bifurcation
  • Stability
  • Wave trains


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