662 citations · 8k across the 126 of their papers we have counts for
27 papers · 1 filter
Evidence of scale-free clusters of vegetation in tropical rainforests
Pablo Villegas, Tommaso Gili, Guido Caldarelli +1
Tropical rainforests exhibit a rich repertoire of spatial patterns emerging from the intricate relationship between the microscopic interaction between species. In particular, the…
Characterizing spatial point processes by percolation transitions
Pablo Villegas, Tommaso Gili, Andrea Gabrielli +1
A set of discrete individual points located in an embedding continuum space can be seen as percolating or non-percolating, depending on the radius of the discs/spheres associated w…
Laplacian Renormalization Group for heterogeneous networks
Pablo Villegas, Tommaso Gili, Guido Caldarelli +1
The renormalization group is the cornerstone of the modern theory of universality and phase transitions, a powerful tool to scrutinize symmetries and organizational scales in dynam…
Emergent spatial patterns of coexistence in species-rich plant communities
Pablo Villegas, Tommaso Gili, Guido Caldarelli
Statistical Physics has proved essential to analyze multi-agent environments. Motivated by the empirical observation of various non-equilibrium features in Barro Colorado and other…
The Grand Canonical ensemble of weighted networks
Andrea Gabrielli, Rossana Mastrandrea, Guido Caldarelli +1
The cornerstone of statistical mechanics of complex networks is the idea that the links, and not the nodes, are the effective particles of the system. Here we formulate a mapping b…
Bond and site color-avoiding percolation in scale free networks
Andrea Kadović, Sebastian M. Krause, Guido Caldarelli +1
Recently the problem of classes of vulnerable vertices (represented by colors) in complex networks has been discussed, where all vertices with the same vulnerability are prone to f…
Topologically biased random walk with application for community finding in networks
Vinko Zlatić, Andrea Gabrielli, Guido Caldarelli
We present a new approach of topology biased random walks for undirected networks. We focus on a one parameter family of biases and by using a formal analogy with perturbation theo…
Uncovering the topology of configuration space networks
David Gfeller, Paolo De Los Rios, David Morton de Lachapelle +2
The configuration space network (CSN) of a dynamical system is an effective approach to represent the ensemble of configurations sampled during a simulation and their dynamic conne…
Networks of equities in financial markets
G. Bonanno, G. Caldarelli, F. Lillo +3
We review the recent approach of correlation based networks of financial equities. We investigate portfolio of stocks at different time horizons, financial indices and volatility t…
Preferential Exchange: Strengthening Connections in Complex Networks
Guido Caldarelli, Fabrizio Coccetti, Paolo De Los Rios
Many social, technological and biological interactions involve network relationships whose outcome intimately depends on the structure of the network and on the strengths of the co…
On the Widespread Occurrence of the Inverse Square Distribution in Social Sciences and Taxonomy
Guido Caldarelli, Cecile Caretta Cartozo, Paolo De Los Rios +1
The widespread occurrence of an inverse square relation in the hierarchical distribution of sub-communities within communities (or sub-species within species) has been recently inv…
The scale-free topology of market investments
Diego Garlaschelli, Stefano Battiston, Maurizio Castri +2
We propose a network description of large market investments, where both stocks and shareholders are represented as vertices connected by weighted links corresponding to shareholdi…
Vertex Intrinsic Fitness: How to Produce Arbitrary Scale-Free Networks
Vito D. P. Servedio, Guido Caldarelli, Paolo Butta`
We study a recent model of random networks based on the presence of an intrinsic character of the vertices called fitness. The vertices fitnesses are drawn from a given probability…
Generalized Network Growth: from Microscopic Strategies to the Real Internet Properties
Guido Caldarelli, Paolo De Los Rios, Luciano Pietronero
In this paper we present a generalized model for network growth that links the microscopical agent strategies with the large scale behavior. This model is intended to reproduce the…
Cycles structure and local ordering in complex networks
Guido Caldarelli, Romualdo Pastor-Satorras, Alessandro Vespignani
We study the properties of metrics aimed at the characterization of grid-like ordering in complex networks. These metrics are based on the global and local behavior of cycles of or…
Topology of correlation based minimal spanning trees in real and model markets
Giovanni Bonanno, Guido Caldarelli, Fabrizio Lillo +1
We present here a topological characterization of the minimal spanning tree that can be obtained by considering the price return correlations of stocks traded in a financial market…
A perturbative approach to the Bak and Sneppen Model
G. Caldarelli, M. Felici, A. Gabrielli +1
We study here the Bak and Sneppen model, a prototype model for the study of Self-Organized Criticality. In this model several species interact and undergo extinction with a power l…
Statistical Features of Drainage Basins in Mars Channel Networks
Guido Caldarelli, Paolo De Los Rios, Marco Montuori
Erosion by flowing water is one of the major forces shaping the surface of Earth. Studies in the last decade have shown, in particular, that the drainage region of rivers, where wa…
Cellular Models for River Networks
G. Caldarelli
A cellular model introduced for the evolution of the fluvial landscape is revisited using extensive numerical and scaling analyses. The basic network shapes and their recurrence es…
Fractal Growth from Local Instabilities
Raffaele Cafiero, Guido Caldarelli
We study, both with numerical simulations and theoretical methods, a cellular automata model for continuum equations describing growth processes in the presence of an external flux…
A Numerical Study on the Evolution of Portfolio Rules: Is CAPM Fit for Nasdaq?
G. Caldarelli, M. Piccioni, E. Sciubba
In this paper we test computationally the performance of CAPM in an evolutionary setting. In particular we study the stability of wealth distribution in a financial market where so…
Damaging and Cracks in Thin Mud Layers
Raffaele Cafiero, Guido Caldarelli, Andrea Gabrielli
We present a detailed study of a two-dimensional minimal lattice model for the description of mud cracking in the limit of extremely thin layers. In this model each bond of the lat…
Roughness of fracture surfaces
Andrea Parisi, Guido Caldarelli, Luciano Pietronero
We study the fracture surface of three dimensional samples through a model for quasi-static fractures known as Born Model. We find for the roughness exponent a value of 0.5 expecte…
Cold and Warm Denaturation of Hydrophobic Polymers
Paolo De Los Rios, Guido Caldarelli
We introduce a polymer model where the transition from swollen to compact configurations is due to interactions between the monomers and the solvent. These interactions are the ori…