170 citations · 3k across the 103 of their papers we have counts for
23 papers · 1 filter
A reduction methodology for fluctuation driven population dynamics
Denis S. Goldobin, Matteo di Volo, Alessandro Torcini
Lorentzian distributions have been largely employed in statistical mechanics to obtain exact results for heterogeneous systems. Analytic continuation of these results is impossible…
Dynamics versus energetics in phase separation
Paolo Politi, Alessandro Torcini
Phase separation may be driven by the minimization of a suitable free energy . This is the case, e.g., for diblock copolimer melts, where is minimized by a ste…
Unfolding times for proteins in a force clamp
Stefano Luccioli, Alberto Imparato, Simon Mitternacht +2
The escape process from the native valley for proteins subjected to a constant stretching force is examined using a model for a Beta-barrel. For a wide range of forces, the unfoldi…
Free energy landscape of mechanically unfolded model proteins: extended Jarzinsky versus inherent structure reconstruction
Stefano Luccioli, Alberto Imparato, Alessandro Torcini
The equilibrium free energy landscape of off-lattice model heteropolymers as a function of an internal coordinate, namely the end-to-end distance, is reconstructed from out-of-equi…
Reconstructing the free energy landscape of a mechanically unfolded model protein
Alberto Imparato, Stefano Luccioli, Alessandro Torcini
The equilibrium free energy landscape of an off-lattice model protein as a function of an internal (reaction) coordinate is reconstructed from out-of-equilibrium mechanical unfoldi…
Contact processes with long-range interactions
F. Ginelli, H. Hinrichsen, R. Livi +2
A class of non-local contact processes is introduced and studied using mean-field approximation and numerical simulations. In these processes particles are created at a rate which…
Asymptotic and effective coarsening exponents in surface growth models
Paolo Politi, Alessandro Torcini
We consider a class of unstable surface growth models, z_t = -\partial_x J, developing a mound structure of size lambda and displaying a perpetual coarsening process, i.e. an endle…
First-order microcanonical transitions in finite mean-field models
Mickael Antoni, Stefano Ruffo, Alessandro Torcini
A microcanonical first order transition, connecting a clustered to a homogeneous phase, is studied from both the thermodynamic and dynamical point of view for a N-body Hamiltonian…
Thermally activated processes in polymer dynamics
Lorenzo Bongini, Roberto Livi, Alessandro Torcini +1
Jumps between neighboring minima in the energy landscape of both homopolymeric and heteropolymeric chains are numerically investigated by determining the average escape time from d…
Doppler Effect of Nonlinear Waves and Superspirals in Oscillatory Media
Lutz Brusch, Alessandro Torcini, Markus Baer
Nonlinear waves emitted from a moving source are studied. A meandering spiral in a reaction-diffusion medium provides an example, where waves originate from a source exhibiting a b…
From multiplicative noise to directed percolation in wetting transitions
F. Ginelli, V. Ahlers, R. Livi +4
A simple one-dimensional microscopic model of the depinning transition of an interface from an attractive hard wall is introduced and investigated. Upon varying a control parameter…
The Hamiltonian Mean Field Model: from Dynamics to Statistical Mechanics and back
Thierry Dauxois, Vito Latora, Andrea Rapisarda +2
The thermodynamics and the dynamics of particle systems with infinite-range coupling display several unusual and new features with respect to systems with short-range interactions.…
Coarsening process in one-dimensional surface growth models
Alessandro Torcini, Paolo Politi
Surface growth models may give rise to unstable growth with mound formation whose tipical linear size L increases in time. In one dimensional systems coarsening is generally driven…
Front Propagation in Chaotic and Noisy Reaction-Diffusion Systems: a Discrete-Time Map Approach
Alessandro Torcini, Angelo Vulpiani, Andrea Rocco
We study the front propagation in Reaction-Diffusion systems whose reaction dynamics exhibits an unstable fixed point and chaotic or noisy behaviour. We have examined the influence…
A dynamical approach to protein folding
Alessandro Torcini, Roberto Livi, Antonio Politi
In this paper we show that a dynamical description of the protein folding process provides an effective representation of equilibrium properties and it allows for a direct investig…
Coarsening in surface growth models without slope selection
Paolo Politi, Alessandro Torcini
We study conserved models of crystal growth in one dimension [] which are linearly unstable and develop a mound structure whose typical size…
Dynamics and statistics of simple models with infinite-range attractive interaction
Mickael Antoni, Stefano Ruffo, Alessandro Torcini
In this paper we review a series of results obtained for 1D and 2D simple N-body dynamical models with infinite-range attractive interactions and without short distance singulariti…
An integration scheme for reaction-diffusion models
M. Nitti, A. Torcini, S. Ruffo
A detailed description and validation of a recently developed integration scheme is here reported for one- and two-dimensional reaction-diffusion models. As paradigmatic examples o…
Comment on ``Lyapunov Exponent of a Many Body System and Its Transport Coefficients''
A. Torcini, Ch. Dellago, H. A. Posch
In a recent Letter, Barnett, Tajima, Nishihara, Ueshima and Furukawa obtained a theoretical expression for the maximum Lyapunov exponent of a dilute gas. They conclude that $…
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…
Analytical Estimation of the Maximal lyapunov Exponent in Oscillator Chains
Thierry Dauxois, Stefano Ruffo, Alessandro Torcini
An analytical expression for the maximal Lyapunov exponent in generalized Fermi-Pasta-Ulam oscillator chains is obtained. The derivation is based on the calculation of modula…
Anomalous diffusion as a signature of collapsing phase in two dimensional self-gravitating systems
Mickael Antoni, Alessandro Torcini
A two dimensional self-gravitating Hamiltonian model made by fully-coupled classical particles exhibits a transition from a collapsing phase (CP) at low energy to a homogeneous…
Localization and Equipartition of Energy in the beta-FPU Chain : Chaotic Breathers
Thierry Cretegny, Thierry Dauxois, Stefano Ruffo +1
The evolution towards equipartition in the -FPU chain is studied considering as initial condition the highest frequency mode. Above an analytically derived energy threshold, thi…