Now showing items 21-40 of 120

  • Correlations in complex networks 

    Serrano Moral, Maria Angeles; Boguña Espinal, Marian; Pastor Satorras, Romualdo; Vespignani, Alessandro (2007-01-01)
    Part of book or chapter of book
    Restricted access - publisher's policy
    This book is the culmination of three years of research effort on a multidisciplinary project in which physicists, mathematicians, computer scientists and social scientists worked together to arrive at a unifying picture ...
  • Correlations in weighted networks 

    Serrano Moral, Maria Angeles; Boguña Espinal, Marian; Pastor Satorras, Romualdo (2006-11)
    Article
    Open Access
    We develop a statistical theory to characterize correlations in weighted networks. We define the appropriate metrics quantifying correlations and show that strictly uncorrelated weighted networks do not exist due to the ...
  • Critical behavior and conservation in directed sandpiles 

    Pastor Satorras, Romualdo; Vespignani, Alessandro (2000-11)
    Article
    Open Access
    We perform large-scale simulations of directed sandpile models with both deterministic and stochastic toppling rules. Our results show the existence of two distinct universality classes. We also provide numerical simulations ...
  • Critical load and congestion instabilities in scale-free networks 

    Moreno, Y; Pastor Satorras, Romualdo; Vázquez, A; Vespignani, Alessandro (2003-02-14)
    Article
    Open Access
  • Cut-offs and finite size effects in scale-free networks 

    Boguña Espinal, Marian; Pastor Satorras, Romualdo; Vespignani, Alessandro (Springer, 2004-03-01)
    Article
    Open Access
    We analyze the degree distribution’s cut-off in finite size scale-free networks. We show that the cut-off behavior with the number of vertices N is ruled by the topological constraints induced by the connectivity structure ...
  • Diffusion-annihilation processes in complex networks 

    Catanzaro, M; Boguña Espinal, Marian; Pastor Satorras, Romualdo (2005-05-10)
    Article
    Open Access
    We present a detailed analytical study of the A+A¿/0 diffusion-annihilation process in complex networks. By means of microscopic arguments, we derive a set of rate equations for the density of A particles in vertices of a ...
  • Dipolar interactions induced order in assemblies of magnetic particles 

    Pastor Satorras, Romualdo; Rubí Capaceti, José Miguel (2000-10-27)
    Article
    Open Access
    We discuss the appearance of ordered structures in assemblies of magnetic particles. The phenomenon occurs when dipolar interactions and the thermal motion of the particles compete, and is mediated by screening and excluded ...
  • Distinct types of eigenvector localization in networks 

    Pastor Satorras, Romualdo; Castellano, Claudio (Macmillan Publishers, 2016-01-12)
    Article
    Open Access
    The spectral properties of the adjacency matrix provide a trove of information about the structure and function of complex networks. In particular, the largest eigenvalue and its associated principal eigenvector are crucial ...
  • Dynamical and correlation properties of the Internet 

    Pastor Satorras, Romualdo; Vázquez, A; Vespignani, Alessandro (American Institute of Physics (AIP), 2001-11)
    Article
    Open Access
    The description of the Internet topology is an important open problem, recently tackled with the introduction of scale-free networks. We focus on the topological and dynamical properties of real Internet maps in a three-year ...
  • Dynamical patterns of epidemic outbreaks in complex heterogeneous networks 

    Barthelemy, M; Barrat, A; Pastor Satorras, Romualdo; Vespignani, Alessandro (2005-03-10)
    Article
    Open Access
    We present a thorough inspection of the dynamical behavior of epidemic phenomena in populations with complex and heterogeneous connectivity patterns. We show that the growth of the epidemic prevalence is virtually instantaneous ...
  • Effect of risk perception on epidemic spreading in temporal networks 

    Moinet, Antoine; Pastor Satorras, Romualdo; Barrat, Alain (American Chemical Society (ACS), 2018-01-31)
    Article
    Open Access
    Many progresses in the understanding of epidemic spreading models have been obtained thanks to numerous modeling efforts and analytical and numerical studies, considering host populations with very different structures and ...
  • Effects of heterogeneous social interactions on flocking dynamics 

    Miguel Lopez, M. Del Carmen; Parley, Jack Thomas; Pastor Satorras, Romualdo (2018-02-08)
    Article
    Open Access
    Social relationships characterize the interactions that occur within social species and may have an important impact on collective animal motion. Here, we consider a variation of the standard Vicsek model for collective ...
  • Effects of local population structure in a reaction-diffusion model of a contact process on metapopulation networks 

    de Souza Mata, Angelica; Ferreira, Silvio C.; Pastor Satorras, Romualdo (2013-10-30)
    Article
    Open Access
    We investigate the effects of local population structure in reaction-diffusion processes representing a contact process (CP) on metapopulations represented as complex networks. Considering a model in which the nodes of a ...
  • Effects of mobility on ordering dynamics 

    Baronchelli, Andrea; Pastor Satorras, Romualdo (2009-11)
    Article
    Restricted access - publisher's policy
    Models of ordering dynamics allow us to understand natural systems in which an initially disordered population homogenizes some traits via local interactions. The simplest of these models, with wide applications ranging ...
  • Effects of temporal correlations in social multiplex networks 

    Starnini, Michele; Baronchelli, Andrea; Pastor Satorras, Romualdo (Macmillan Publishers, 2017-08-17)
    Article
    Open Access
    Multi-layered networks represent a major advance in the description of natural complex systems, and their study has shed light on new physical phenomena. Despite its importance, however, the role of the temporal dimension ...
  • Eigenvector localization in real networks and its implications for epidemic spreading 

    Pastor Satorras, Romualdo; Castellano, Claudio (2018-02-10)
    Article
    Open Access
    The spectral properties of the adjacency matrix, in particular its largest eigenvalue and the associated principal eigenvector, dominate many structural and dynamical properties of complex networks. Here we focus on the ...
  • Entropy of form and hierarchic organization 

    Wagensberg Lubinski, Jorge; Pastor Satorras, Romualdo (1992)
    Part of book or chapter of book
    Restricted access - author's decision
    The use of the Theory of Information as a mathematical tool for the understanding of complex systems allows the application of the MaxEnt Principle as a criterion for the prediction of the final stationary states. The ...
  • Epidemic dynamics and endemic states in complex networks 

    Pastor Satorras, Romualdo; Vespignani, Alessandro (2001-05-22)
    Article
    Open Access
    We study by analytical methods and large scale simulations a dynamical model for the spreading of epidemics in complex networks. In networks with exponentially bounded connectivity we recover the usual epidemic behavior ...
  • Epidemic dynamics in finite size scale-free networks 

    Pastor Satorras, Romualdo; Vespignani, Alessandro (American Institute of Physics (AIP), 2002-03)
    Article
    Open Access
    Many real networks present a bounded scale-free behavior with a connectivity cutoff due to physical constraints or a finite network size. We study epidemic dynamics in bounded scale-free networks with soft and hard ...
  • Epidemic outbreaks in complex heterogeneous networks 

    Moreno, Y; Pastor Satorras, Romualdo; Vespignani, Alessandro (Springer, 2002-04)
    Article
    Open Access
    We present a detailed analytical and numerical study for the spreading of infections with acquired immunity in complex population networks. We show that the large connectivity fluctuations usually found in these networks ...