Feedback-induced stationary localized patterns in networks of diffusively coupled bistable elements

Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society Faradayweg 4-6, D-14195 Berlin, Germany, EU

^(a) nkoub@fhi-berlin.mpg.de

Received: 8 January 2013
Accepted: 24 March 2013

Abstract

Effects of feedbacks on self-organization phenomena in networks of diffusively coupled bistable elements are investigated. For regular trees, an approximate analytical theory for localized stationary patterns under application of global feedbacks is constructed. Using it, properties of such patterns in different parts of the parameter space are discussed. Numerical investigations are performed for large random Erdös-Rényi and scale-free networks. In both kinds of systems, localized stationary activation patterns have been observed. The active nodes in such a pattern form a subnetwork, whose size decreases as the feedback intensity is increased. For strong feedbacks, active subnetworks are organized as trees. Additionally, local feedbacks affecting only the nodes with high degrees (i.e., hubs) or the periphery nodes are considered.