10.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Sapienza University of RomeIT156 papers
- Scuola Internazionale Superiore di Studi AvanzatiIT146 papers
- University of InsubriaIT88 papers
- University of MilanIT85 papers
- University of TrentoIT85 papers
- Politecnico di TorinoIT78 papers
- University of FlorenceIT74 papers
- University of GenoaIT69 papers
- Centre National de la Recherche ScientifiqueFR65 papers
- The Abdus Salam International Centre for Theoretical Physics (ICTP)IT65 papers
- National Research CouncilLK58 papers
- University of SalernoIT56 papers
19 papers · 2 filters
The quantum Heisenberg antiferromagnet on the square lattice
A. Cuccoli, V. Tognetti, P. Verrucchi +1
The pure-quantum self-consistent harmonic approximation, a semiclassical method based on the path-integral formulation of quantum statistical mechanics, is applied to the study of…
Molecular Correlations in a Supercooled Liquid
L. Fabbian, A. Latz, R. Schilling +3
We present static and dynamic properties of molecular correlation functions S_{lmn,l'm'n'}(q,t) in a simulated supercooled liquid of water molecules, as a preliminary effort in the…
A Variational Approach to the Localization Transition of Heteropolymers at Interfaces
Antonio Trovato, Amos Maritan
A chain with random hydrophobic-hydrophilic charges is studied in the presence of an interface separating a polar from a non polar solvent. Within a Gaussian variational approach i…
Effective Hamiltonian with holomorphic variables
A. Cuccoli, V. Tognetti, R. Giachetti +2
The pure-quantum self-consistent harmonic approximation (PQSCHA) permits to study a quantum system by means of an effective classical Hamiltonian - depending on quantum coupling an…
Interface pinning and slow ordering kinetics on infinitely ramified fractal structures
Umberto Marini Bettolo Marconi
We investigate the time dependent Ginzburg-Landau (TDGL) equation for a non conserved order parameter on an infinitely ramified (deterministic) fractal lattice employing two altern…
Multiscale behaviour of volatility autocorrelations in a financial market
Michele Pasquini, Maurizio Serva
We perform a scaling analysis on NYSE daily returns. We show that volatility correlations are power-laws on a time range from one day to one year and, more important, that they exh…
Topological aspects of geometrical signatures of phase transitions
Roberto Franzosi, Lapo Casetti, Lionel Spinelli +1
Certain geometric properties of submanifolds of configuration space are numerically investigated for classical lattice phi^4 models in one and two dimensions. Peculiar behaviors of…
Topological origin of the phase transition in a mean-field model
Lapo Casetti, E. G. D. Cohen, Marco Pettini
We argue that the phase transition in the mean-field XY model is related to a particular change in the topology of its configuration space. The nature of this topological transitio…
Lagrangian method for multiple correlations in passive scalar advection
U. Frisch, A. Mazzino, A. Noullez +1
A Lagrangian method is introduced for calculating simultaneous n-point correlations of a passive scalar advected by a random velocity field, with random forcing and finite molecula…
Persistence exponent in a superantiferromagnetic quenching
Emilio N. M. Cirillo, Giuseppe Gonnella, Sebastiano Stramaglia
We measure the persistence exponent in a phase separating two-dimensional spin system with non-conserved dynamics quenched in a region with four coexisting stripe phases. The syste…
Equilibrium and dynamical properties of two dimensional self-gravitating systems
Alessandro Torcini, Mickael Antoni
A system of N classical particles in a 2D periodic cell interacting via long-range attractive potential is studied. For low energy density a collapsed phase is identified, whil…
Hamiltonian dynamics of the two-dimensional lattice phi^4 model
Lando Caiani, Lapo Casetti, Marco Pettini
The Hamiltonian dynamics of the classical model on a two-dimensional square lattice is investigated by means of numerical simulations. The macroscopic observables are compute…
Modeling of Financial Data: Comparison of the Truncated Lévy Flight and the ARCH(1) and GARCH(1,1) processes
Rosario N. Mantegna, H. Eugene Stanley
We compare our results on empirical analysis of financial data with simulations of two stochastic models of the dynamics of stock market prices. The two models are (i) the truncate…
Breakdown of Scale Invariance in the Phase Ordering of Fractal Clusters
Massimo Conti, Baruch Meerson, Pavel V. Sasorov
Our numerical simulations with the Cahn-Hilliard equation show that coarsening of fractal clusters (FCs) is not a scale-invariant process. On the other hand, a typical coarsening l…
Folding, Design and Determination of Interaction Potentials Using Off-Lattice Dynamics of Model Heteropolymers
Cecilia Clementi, Amos Maritan, Jayanth R. Banavar
We present the results of a self-consistent, unified molecular dynamics study of simple model heteropolymers in the continuum with emphasis on folding, sequence design and the dete…
Hierarchical Structure in Financial Markets
Rosario N. Mantegna
I find a topological arrangement of stocks traded in a financial market which has associated a meaningful economic taxonomy. The topological space is a graph connecting the stocks…
Intermittency in passive scalar advection
U. Frisch, A. Mazzino, M. Vergassola
A Lagrangian method for the numerical simulation of the Kraichnan passive scalar model is introduced. The method is based on Monte--Carlo simulations of tracer trajectories, supple…
Mean-field behavior of the sandpile model below the upper critical dimension
Alessandro Chessa, Enzo Marinari, Alessandro Vespignani +1
We present results of large scale numerical simulations of the Bak, Tang and Wiesenfeld sandpile model. We analyze the critical behavior of the model in Euclidean dimensions $2\leq…
Boundary effects in a random neighbor model of earthquakes
Stefano Lise, Attilio L. Stella
We introduce spatial inhomogeneities (boundaries) in a random neighbor version of the Olami, Feder and Christensen model [Phys. Rev. Lett. 68, 1244 (1992)] and study the distributi…