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Synchronisation transitions caused by time-varying coupling functions

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>9/09/2019
<mark>Journal</mark>Philosophical Transactions of the Royal Society of London A
Publication statusAccepted/In press
Original languageEnglish


Interacting dynamical systems are widespread in nature. The influence that one such system exerts on another is described by a coupling function; and the coupling functions extracted from the time-series of interacting dynamical systems are often found to be time-varying. Although much effort has been devoted to the analysis of coupling functions, the influence of time-variability on the associated dynamics remains largely unexplored. Motivated especially by coupling functions in biology, including the cardiorespiratory and neural delta-alpha coupling functions, this paper offers a contribution to the understanding of effects due to time-varying interactions. Through both numerics and mathematically rigorous theoretical consideration, we show that for time-variable coupling functions with time-independent net coupling strength, transitions into and out of phase-synchronisation can occur, even though the frozen coupling functions determine phase-synchronisation solely by virtue of their net coupling strength. Thus the information about interactions provided by the shape of coupling functions plays a greater role in determining behaviour when these coupling functions are time-variable.