Classification of coupled dynamical systems with multiple delays: finding the minimal number of delays. (English) Zbl 1418.34069
Summary: In this article we study networks of coupled dynamical systems with time-delayed connections. If two such networks hold different delays on the connections, it is in general possible that they exhibit different dynamical behavior as well. We prove that for particular sets of delays this is not the case. To this aim we introduce a componentwise timeshift transformation (CTT) which allows us to classify systems which possess equivalent dynamics, though possibly different sets of connection delays. In particular, we show for a large class of semiflows (including the case of delay differential equations) that the stability of attractors is invariant under this transformation. Moreover we show that each equivalence class which is mediated by the CTT possesses a representative system in which the number of different delays is not larger than the cycle space dimension of the underlying graph. We conclude that the “true” dimension of the corresponding parameter space of delays is in general smaller than it appears at first glance.
MSC:
| 34B45 | Boundary value problems on graphs and networks for ordinary differential equations |
| 34K17 | Transformation and reduction of functional-differential equations and systems, normal forms |
| 34K20 | Stability theory of functional-differential equations |
Keywords:
multiple delays; networks with delay; delay differential equations; dynamical equivalence; cycle spaceReferences:
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