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Cucker-Smale model with finite speed of information propagation: Well-posedness, flocking and mean-field limit

  • *Corresponding author: Jan Haskovec

    *Corresponding author: Jan Haskovec
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  • We study a variant of the Cucker-Smale model where information between agents propagates with a finite speed $ {{\mathfrak{c}}}>0 $. This leads to a system of functional differential equations with state-dependent delay. We prove that, if initially the agents travel slower than $ {{\mathfrak{c}}} $, then the discrete model admits unique global solutions. Moreover, under a generic assumption on the influence function, we show that there exists a critical information propagation speed $ {{{{\mathfrak{c}}}^\ast}}>0 $ such that if $ {{\mathfrak{c}}}\geq{{{{\mathfrak{c}}}^\ast}} $, the system exhibits asymptotic flocking in the sense of the classical definition of Cucker and Smale. For constant initial datum the value of $ {{{{\mathfrak{c}}}^\ast}} $ is explicitly calculable. Finally, we derive a mean-field limit of the discrete system, which is formulated in terms of probability measures on the space of time-dependent trajectories. We show global well-posedness of the mean-field problem and argue that it does not admit a description in terms of the classical Fokker-Planck equation.

    Mathematics Subject Classification: Primary: 34K43, 34K25, 35Q84; Secondary: 82C22, 93D50.

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