Early fragmentation in the adaptive voter model on directed networks
  We consider voter dynamics on a directed adaptive network with fixed out-degree distribution. A transition between an active phase and a fragmented phase is observed. This transition is similar to the undirected case if the networks are sufficiently dense and have a narrow out-degree distribution. However, if a significant number of nodes with low out degree is present, then fragmentation can occur even far below the estimated critical point due to the formation of self-stabilizing structures that nucleate fragmentation. This process may be relevant for fragmentation in current political opinion formation processes. 
Gerd Zschaler, Gesa A. B\"ohme, Michael Sei{\ss}inger, Cristi\'an   Huepe, Thilo Gross
nlin.AO