Dynamics of traveling pulses in heterogeneous media of jump type

Yasumasa Nishiura, Yoshihito Oyama, Kei Ichi Ueda

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


We study pulse dynamics in one-dimensional heterogeneous media. In particular we focus on the case where the pulse is close to the singularity of codim 2 type consisting of drift and saddle-node instabilities in a parameter space. We assume that the heterogeneity is of jump type, namely one of the coefficients of the system undergoes an abrupt change at one point in the space. Depending on the height of this jump, the responses of pulse behavior are penetration, splitting, and rebound. Taking advantage of the fact that pulse is close to the singularity, the PDE dynamics can be reduced to a finite-dimensional system, which displays the three behaviors. Moreover it takes a universal form independent of model systems, and is valid for much more general heterogeneities such as bump, periodic, and random cases.

Original languageEnglish
Pages (from-to)207-242
Number of pages36
JournalHokkaido Mathematical Journal
Issue number1
Publication statusPublished - 2007


  • Bifurcation (35B32)
  • Homoclinic and heteroclinic solutions (34C37)
  • Reaction-diffusion equations (35K57)

ASJC Scopus subject areas

  • Mathematics(all)


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