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Títol:	Collective versus hub activation of epidemic phases on networks
Autor/a:	Ferreira, Silvio C.; Salvador, Renan; Pastor Satorras, Romualdo
Altres autors:	Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
Abstract:	We consider a general criterion to discern the nature of the threshold in epidemic models on scale-free (SF) networks. Comparing the epidemic lifespan of the nodes with largest degrees with the infection time between them, we propose a general dual scenario, in which the epidemic transition is either ruled by a hub activation process, leading to a null threshold in the thermodynamic limit, or given by a collective activation process, corresponding to a standard phase transition with a finite threshold. We validate the proposed criterion applying it to different epidemic models, with waning immunity or heterogeneous infection rates in both synthetic and real SF networks. In particular, a waning immunity, irrespective of its strength, leads to collective activation with finite threshold in scale-free networks with large degree exponent, at odds with canonical theoretical approaches.
Matèries:	-Àrees temàtiques de la UPC::Física -Random graphs -Complex networks and dynamic systems -Dynamics -Scale-free networks -Complex networks -Random graphs -Dynamics -Sistemes dinàmics aleatoris -Dinàmica
Drets:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Tipus de document:	Article - Versió presentada Article
Publicat per:	AMER PHYSICAL SOC
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