Journal of Statistical Physics

, 144:923

A New Model for Self-organized Dynamics and Its Flocking Behavior

Article

DOI: 10.1007/s10955-011-0285-9

Cite this article as:
Motsch, S. & Tadmor, E. J Stat Phys (2011) 144: 923. doi:10.1007/s10955-011-0285-9

Abstract

We introduce a model for self-organized dynamics which, we argue, addresses several drawbacks of the celebrated Cucker-Smale (C-S) model. The proposed model does not only take into account the distance between agents, but instead, the influence between agents is scaled in term of their relative distance. Consequently, our model does not involve any explicit dependence on the number of agents; only their geometry in phase space is taken into account. The use of relative distances destroys the symmetry property of the original C-S model, which was the key for the various recent studies of C-S flocking behavior. To this end, we introduce here a new framework to analyze the phenomenon of flocking for a rather general class of dynamical systems, which covers systems with non-symmetric influence matrices. In particular, we analyze the flocking behavior of the proposed model as well as other strongly asymmetric models with “leaders”.

The methodology presented in this paper, based on the notion of active sets, carries over from the particle to kinetic and hydrodynamic descriptions. In particular, we discuss the hydrodynamic formulation of our proposed model, and prove its unconditional flocking for slowly decaying influence functions.

Keywords

Self-organized dynamics Flocking Active sets Kinetic formulation Moments Hydrodynamic formulation 

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Center for Scientific Computation and Mathematical Modeling (CSCAMM)University of MarylandCollege ParkUSA
  2. 2.Department of Mathematics, Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkUSA