Convective Lyapunov exponents and propagation of correlations

G Giacomelli, R Hegger, A Politi, M Vassalli

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We conjecture that in one-dimensional spatially extended systems the propagation velocity of correlations coincides with a zero of the convective Lyapunov spectrum. This conjecture: is successfully tested in three different contexts: (i) a Hamiltonian system (a Fermi-Pasta-Ulam chain of oscillators); (ii) a general model for spatiotemporal chaos (the complex Ginzburg-Landau equation); (iii) experimental data taken from a CO2- laser with delayed feedback. In the last case, the convective Lyapunov exponent is determined directly from the experimental data.

Original languageEnglish
Pages (from-to)3616-3619
Number of pages4
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 23 Oct 2000


  • coupled-map lattices
  • dynamical-systems
  • feedback
  • flow


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