Reduction of Interaction Delays in Networks

Abstract

Delayed interactions are a common property of coupled natural systems and therefore arise in a variety of different applications. For instance, signals in neural or laser networks propagate at finite speed giving rise to delayed connections. Such systems are often modeled by delay differential equations with discrete delays. In realistic situations, these delays are not identical on different connections. We show that by a componentwise timeshift transformation it is often possible to reduce the number of different delays and simplify the models without loss of information. We identify dynamic invariants of this transformation, determine its capabilities to reduce the number of delays and interpret these findings in terms of the topology of the underlying graph. In particular, we show that networks with identical sums of delay times along the fundamental semicycles are dynamically equivalent and we provide a normal form for these systems. We illustrate the theory using a network motif of coupled Mackey-Glass systems with 8 different time delays, which can be reduced to an equivalent motif with three delays.

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Cited by in corpus (7)

• Chimera states in uncoupled neurons induced by a multilayer structure
• Delay-induced patterns in a two-dimensional lattice of coupled oscillators
• Embedding the dynamics of a single delay system into a feed-forward ring
• Classification of coupled dynamical systems with multiple delays: Finding the minimal number of delays
• A new method to reduce the number of time delays in a network
• Reducing the number of time delays in coupled dynamical systems
• Pattern Recognition in a Ring of Delayed Phase Oscillators