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Ara es mostren els items 54-73 de 134

    • Field theory for a reaction-diffusion model of quasispecies dynamics 

      Pastor Satorras, Romualdo; Solé, Ricard Vicenç (2001-10-24)
      Article
      Accés obert
      RNA viruses are known to replicate with extremely high mutation rates. These rates are actually close to the so-called error threshold. This threshold is in fact a critical point beyond which genetic information is lost ...

    • Field theory of absorbing phase transitions with a nondiffusive conserved field 

      Pastor Satorras, Romualdo; Vespignani, Alessandro (2000-11)
      Article
      Accés obert
      We investigate the critical behavior of a reaction-diffusion system exhibiting a continuous absorbing-state phase transition. The reaction-diffusion system strictly conserves the total density of particles, represented as ...

    • Flocking dynamics mediated by weighted social networks 

      Ojer Ferrer, Jaume; Pastor Satorras, Romualdo (American Institute of Physics (AIP), 2022-10-03)
      Article
      Accés restringit per política de l'editorial
      We study the effects of animal social networks with a weighted pattern of interactions on the flocking transition exhibited by models of self-organized collective motion. We consider variations of traditional models of ...

    • Fractal properties of cluster of colloidal magnetic particles 

      Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (1998-05)
      Article
      Accés restringit per política de l'editorial
      We have studied the properties of clusters of colloidal magnetic particles generated from a 2D aggregation model with dipolar interparticle interactions. Particles diffuse off-lattice, experiencing dipolar 1 with the already ...

    • Generalized voter-like models on heterogeneous networks 

      Moretti, Paolo; Baronchelli, Andrea; Starnini, Michele; Pastor Satorras, Romualdo (Springer, 2013)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This Chapter presents a generalized model of consensus formation, which is able to encompass all previous formulations of copy/invasion processes inspired by variations on the voter model and the Moran process. It considered ...

    • Generalized voterlike model on activity-driven networks with attractiveness 

      Moinet, Antoine; Barrat, Alain; Pastor Satorras, Romualdo (American Institute of Physics (AIP), 2018-08-06)
      Article
      Accés obert
      We study the behavior of a generalized consensus dynamics on a temporal network of interactions, the activity-driven network with attractiveness. In this temporal network model, agents are endowed with an intrinsic activity ...

    • Generation of uncorrelated random scale-free networks 

      Catanzaro, Michele; Boguña Espinal, Marian; Pastor Satorras, Romualdo (2005-02)
      Article
      Accés obert
      Uncorrelated random scale-free networks are useful null models to check the accuracy and the analytical solutions of dynamical processes defined on complex networks. We propose and analyze a model capable of generating ...

    • Glass transition and random walks on complex energy landscapes 

      Baronchelli, Andrea; Barrat, Alain; Pastor Satorras, Romualdo (2009-08)
      Article
      Accés obert
      We present a simple mathematical model of glassy dynamics seen as a random walk in a directed weighted network of minima taken as a representation of the energy landscape. Our approach gives a broader perspective to previous ...

    • Growth of oriented chains in dipolar colloids 

      Miguel Lopez, M. Del Carmen; Pastor Satorras, Romualdo (1999-11-29)
      Article
      Accés restringit per política de l'editorial
      We investigate the dynamics of the irreversible aggregation of linear rigid chains oriented along a preferred direction. We propose a Monte Carlo model, whose key ingredient is a logarithmically corrected anisotropic ...

    • Heterogenous mean-field analysis of a generalized voter-like model on networks 

      Moretti, Paolo; Liu, S.Y.; Baronchelli, Andrea; Pastor Satorras, Romualdo (Springer, 2012-03)
      Article
      Accés obert
      We propose a generalized framework for the study of voter models in complex networks at the heterogeneous mean-field (HMF) level that (i) yields a unified picture for existing copy/invasion processes and (ii) allows for ...

    • Immunization of complex networks 

      Pastor Satorras, Romualdo; Vespignani, Alessandro (2002-02)
      Article
      Accés obert
      Complex networks such as the sexual partnership web or the Internet often show a high degree of redundancy and heterogeneity in their connectivity properties. This peculiar connectivity provides an ideal environment for ...

    • Immunization strategies for epidemic processes in time-varying contact networks 

      Starnini, Michele; Machens, Anna; Cattuto, Ciro; Barrat, Alain; Pastor Satorras, Romualdo (2013)
      Article
      Accés obert
      preading processes represent a very efficient tool to investigate the structural properties of networks and the relative importance of their constituents, and have been widely used to this aim in static networks. Here we ...

    • Influence of individual nodes for continuous-time susceptible-infected-susceptible dynamics on synthetic and real-world networks 

      De Bellis, Alfredo; Pastor Satorras, Romualdo; Castellano, Claudio (American Institute of Physics (AIP), 2021-07-01)
      Article
      Accés obert
      In the study of epidemic dynamics a fundamental question is whether a pathogen initially affecting only one individual will give rise to a limited outbreak or to a widespread pandemic. The answer to this question crucially ...

    • Irrelevance of information outflow in opinion dynamics models 

      Castellano, Claudio; Pastor Satorras, Romualdo (2011-01-27)
      Article
      Accés obert
      The Sznajd model for opinion dynamics has attracted a large interest as a simple realization of the psychological principle of social validation. As its most salient feature, it has been claimed that the Sznajd model is ...

    • Kinetic growth of field-oriented chains in dipolar colloidal solutions 

      Miguel Lopez, M. Del Carmen; Pastor Satorras, Romualdo (1999-01)
      Article
      Accés obert
      Experimental studies on the irreversible growth of field-induced chains of dipolar particles suggest an asymptotic power-law behavior of several relevant quantities. We introduce a Monte Carlo model of chain growth that ...

    • Langevin approach for the dynamics of the contact process on annealed scale-free networks 

      Boguña Espinal, Marian; Castellano, C; Pastor Satorras, Romualdo (2009-03-19)
      Article
      Accés obert
      We study the dynamics of the contact process, one of the simplest nonequilibrium stochastic processes, taking place on a scale-free network. We consider the network topology as annealed, i.e., all links are rewired at each ...

    • Large-scale topological and dynamical properties of the Internet 

      Vázquez, A; Pastor Satorras, Romualdo; Vespignani, Alessandro (2002-06)
      Article
      Accés obert
      We study the large-scale topological and dynamical properties of real Internet maps at the autonomous system level, collected in a 3-yr time interval. We find that the connectivity structure of the Internet presents ...

    • Lifespan method as a tool to study criticality in absorbing-state phase transitions 

      de Souza Mata, Angelica; Boguñá, Marian; Castellano, Claudio; Pastor Satorras, Romualdo (2015-05-12)
      Article
      Accés obert
      In a recent work, a new numerical method (the lifespan method) has been introduced to study the critical properties of epidemic processes on complex networks [M. Boguna, C. Castellano, and R. Pastor-Satorras, Phys. Rev. ...

    • Long-range-interaction induced ordered structures in deposition processes 

      Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (American Institute of Physics (AIP), 1998-06-15)
      Article
      Accés obert
      We present a new model of sequential adsorption in which the adsorbing particles experience dipolar interactions. We show that in the presence of these long-range interactions, highly ordered structures in the adsorbed ...

    • Mean-field analysis of the q-voter model on networks 

      Moretti, Paolo; Liu, Suyu; Castellano, Claudio; Pastor Satorras, Romualdo (2013-04-01)
      Article
      Accés obert
      We present a detailed investigation of the behavior of the nonlinear q-voter model for opinion dynamics. At the mean-field level we derive analytically, for any value of the number q of agents involved in the elementary ...