WIAS Preprint No. 1436, (2009)

The spectrum of delay differential equations with large delay


  • Lichtner, Mark
  • Wolfrum, Matthias
    ORCID: 0000-0002-4278-2675
  • Yanchuk, Serhiy

2010 Mathematics Subject Classification

  • 34K06 34K20 34K26


  • Spectrum, Delay Differential Equation, Large Delay




We show that the spectrum of linear delay differential equations with large delay splits into two different parts. One part, called the strong spectrum, converges to isolated points when the delay parameter tends to infinity. The other part, called the pseudocontinuous spectrum, accumulates near criticality and converges after rescaling to a set of spectral curves, called the asymptotic continuous spectrum. We show that the spectral curves and strong spectral points provide a complete description of the spectrum for sufficiently large delay and can be comparatively easily calculated by approximating expressions.

Appeared in

  • SIAM J. Math. Anal., 43 (2011) pp. 788-802.

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