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Projectors on the Generalized Eigenspaces for Partial Differential Equations with Time Delay

  • Arnaut Ducrot
  • Pierre Magal
  • Shigui Ruan
Chapter
Part of the Fields Institute Communications book series (FIC, volume 64)

Abstract

To study the nonlinear dynamics, such as Hopf bifurcation, of partial differential equations with delay, one needs to consider the characteristic equation associated to the linearized equation and to determine the distribution of the eigenvalues; that is, to study the spectrum of the linear operator. In this paper we study the projectors on the generalized eigenspaces associated to some eigenvalues for linear partial differential equations with delay. We first rewrite partial differential equations with delay as non-densely defined semilinear Cauchy problems, then obtain formulas for the integrated solutions of the semilinear Cauchy problems with non-dense domain by using integrated semigroup theory, from which we finally derive explicit formulas for the projectors on the generalized eigenspaces associated to some eigenvalues. As examples, we apply the obtained results to study a reaction-diffusion equation with delay and an age-structured model with delay.

Notes

Acknowledgements

Research of S. Ruan was partially supported by NSF grant DMS-1022728.

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© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Institut de Mathématiques de Bordeaux UMR CNRS 5251Université de BordeauxBordeauxFrance
  2. 2.Department of MathematicsUniversity of MiamiCoral GablesUSA

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