Numerical continuation of spiral waves in heteroclinic networks of cyclic dominance

Hasan, C. R. , Osinga, H. M., Postlethwaite, C. M. and Rucklidge, A. M. (2021) Numerical continuation of spiral waves in heteroclinic networks of cyclic dominance. IMA Journal of Applied Mathematics, 86(5), pp. 1141-1163. (doi: 10.1093/imamat/hxab027)

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Heteroclinic-induced spiral waves may arise in systems of partial differential equations that exhibit robust heteroclinic cycles between spatially uniform equilibria. Robust heteroclinic cycles arise naturally in systems with invariant subspaces, and their robustness is considered with respect to perturbations that preserve these invariances. We make use of particular symmetries in the system to formulate a relatively low-dimensional spatial two-point boundary-value problem in Fourier space that can be solved efficiently in conjunction with numerical continuation. The standard numerical set-up is formulated on an annulus with small inner radius, and Neumann boundary conditions are used on both inner and outer radial boundaries. We derive and implement alternative boundary conditions that allow for continuing the inner radius to zero and so compute spiral waves on a full disk. As our primary example, we investigate the formation of heteroclinic-induced spiral waves in a reaction–diffusion model that describes the spatiotemporal evolution of three competing populations in a 2D spatial domain—much like the Rock–Paper–Scissors game. We further illustrate the efficiency of our method with the computation of spiral waves in a larger network of cyclic dominance between five competing species, which describes the so-called Rock–Paper–Scissors–Lizard–Spock game.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hasan, Dr Cris
Authors: Hasan, C. R., Osinga, H. M., Postlethwaite, C. M., and Rucklidge, A. M.
College/School:College of Social Sciences > Adam Smith Business School
Journal Name:IMA Journal of Applied Mathematics
Publisher:Oxford University Press
ISSN (Online):1464-3634
Published Online:15 July 2021

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