Ara es mostren els items 69-88 de 134

    • 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 ...
    • Mean-field diffusive dynamics on weighted networks 

      Baronchelli, Andrea; Pastor Satorras, Romualdo (2010-07-12)
      Article
      Accés obert
      Diffusion is a key element of a large set of phenomena occurring on natural and social systems modeled in terms of complex weighted networks. Here, we introduce a general formalism that allows to easily write down mean-field ...
    • Model of correlated sequential adsorption of colloidal particles 

      Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (2001-06-11)
      Article
      Accés obert
      We present results of a model of sequential adsorption in which the adsorbing particles are correlated with the particles attached to the substrate. The strength of the correlations is measured by a tunable parameter s. ...
    • Model reproduces individual, group and collective dynamics of human contact networks 

      Starnini, Michele; Baronchelli, Andrea; Pastor Satorras, Romualdo (2016-10-01)
      Article
      Accés obert
      Empirical data on the dynamics of human face-to-face interactions across a variety of social venues have recently revealed a number of context-independent structural and temporal properties of human contact networks. This ...
    • Modeling explosive opinion depolarization in interdependent topics 

      Ojer Ferrer, Jaume; Starnini, Michele; Pastor Satorras, Romualdo (American Institute of Physics (AIP), 2023-05-17)
      Article
      Accés obert
      Understanding the dynamics of opinion depolarization is pivotal to reducing the political divide in our society. We propose an opinion dynamics model, which we name the social compass model, for interdependent topics ...
    • Modeling human dynamics of face-to-face interaction networks 

      Starnini, Michele; Baronchelli, Andrea; Pastor Satorras, Romualdo (American Institute of Physics (AIP), 2013-04-15)
      Article
      Accés obert
      Face-to-face interaction networks describe social interactions in human gatherings, and are the substrate for processes such as epidemic spreading and gossip propagation. The bursty nature of human behavior characterizes ...
    • Models of social networks based on social distance attachment 

      Boguña Espinal, Marian; Pastor Satorras, Romualdo; Díaz-Guilera, A; Arenas, A (2004-11)
      Article
      Accés obert
      We propose a class of models of social network formation based on a mathematical abstraction of the concept of social distance. Social distance attachment is represented by the tendency of peers to establish acquaintances ...
    • Multifractal properties of power-law time sequences: application to rice piles 

      Pastor Satorras, Romualdo (1997-11)
      Article
      Accés obert
      We study the properties of time sequences extracted from a self-organized critical system, within the framework of the mathematical multifractal analysis. To this end, we propose a fixed-mass algorithm, well suited to deal ...
    • Nature of the epidemic threshold for the susceptible-infected-susceptible dynamics in networks 

      Boguñá, Marian; Castellano, Claudio; Pastor Satorras, Romualdo (2013-08-07)
      Article
      Accés obert
      We develop an analytical approach to the susceptible-infected-susceptible epidemic model that allows us to unravel the true origin of the absence of an epidemic threshold in heterogeneous networks. We find that a delicate ...
    • Networks in cognitive science 

      Baronchelli, Andrea; Ferrer Cancho, Ramon; Pastor Satorras, Romualdo; Chatter, Nick; Christiansen, Morten H. (Elsevier, 2013-07-01)
      Article
      Accés obert
      Networks of interconnected nodes have long played a key role in Cognitive Science, from artificial neural networks to spreading activation models of semantic memory. Recently, however, a new Network Science has been ...
    • Non-mean-field behavior of the contact process on scale-free networks 

      Castellano, Claudio; Pastor Satorras, Romualdo (2006)
      Article
      Accés obert
      We present an analysis of the classical contact process on scale-free networks. A mean-field study, both for finite and infinite network sizes, yields an absorbing-state phase transition at a finite critical value of the ...
    • Nonlinear q-voter model 

      Castellano, C; Muñoz, M A; Pastor Satorras, Romualdo (2009-10)
      Article
      Accés obert
      We introduce a nonlinear variant of the voter model, the q-voter model, in which q neighbors (with possible repetition) are consulted for a voter to change opinion. If the q neighbors agree, the voter takes their opinion; ...
    • On the numerical study of percolation and epidemic critical properties in networks 

      Castellano, Claudio; Pastor Satorras, Romualdo (Springer, 2016-11-09)
      Article
      Accés obert
      The static properties of the fundamental model for epidemics of diseases allowing immunity (susceptible-infected-removed model) are known to be derivable by an exact mapping to bond percolation. Yet when performing numerical ...
    • Ordering dynamics of the multi-state voter model 

      Starnini, Michele; Baronchelli, Andrea; Pastor Satorras, Romualdo (Institute of Physics (IOP), 2012-10-30)
      Article
      Accés obert
      The voter model is a paradigm of ordering dynamics. At each time step, a random node is selected and copies the state of one of its neighbors. Traditionally, this state has been considered as a binary variable. Here, we ...
    • Particle-cluster aggregation with dipolar interactions 

      Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (1995-06)
      Article
      Accés obert
      The properties of aggregates generated from an off-lattice, two-dimensional, particle-cluster aggregation model with dipolar interparticle interactions have been investigated. The fractal dimension seems to be a monotonically ...
    • Percolation analysis of force networks in anisotropic granular matter 

      Pastor Satorras, Romualdo; Miguel Lopez, Maria del Carmen (IOP PUBLISHING LTD., 2012-02-09)
      Article
      Accés obert
      We study the percolation properties of force networks in an anisotropic model for granular packings, the so-called q-model. Following the original recipe of Ostojic et al (2006 Nature 439 828), we consider a percolation ...