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- Massimo Pica Ciamarra
- FCT
- 2001

This article is an attempt to generalize the classical theory of reversible computing , principally developed by Bennet [IBM J. This is a fundamental step towards the construction of a quantum computer because a time efficient quantum computation is a reversible physical process. The paper is organized as follows. The first section reviews the classical… (More)

We propose a new model of cluster growth according to which the probability that a new unit is placed in a point at a distance r from the city center is a Gaussian with mean equal to the cluster radius and variance proportional to the mean, modulated by the local density ρ(r). The model is analytically solvable in d = 2 dimensions, where the density profile… (More)

- Raffaele Pastore, Antonio Coniglio, Massimo Pica Ciamarra
- Scientific reports
- 2015

One of the most controversial hypotheses for explaining the heterogeneous dynamics of glasses postulates the temporary coexistence of two phases characterized by a high and by a low diffusivity. In this scenario, two phases with different diffusivities coexist for a time of the order of the relaxation time and mix afterwards. Unfortunately, it is difficult… (More)

- Denis S Grebenkov, Massimo Pica Ciamarra, Mario Nicodemi, Antonio Coniglio
- Physical review letters
- 2008

We study the rheological properties of a granular suspension subject to constant shear stress by constant volume molecular dynamics simulations. We derive the system "flow diagram" in the volume fraction or stress plane (phi, F): at low phi the flow is disordered, with the viscosity obeying a Bagnold-like scaling only at small F and diverging as the jamming… (More)

- Raffaele Pastore, Massimo Pica Ciamarra, Antonio de Candia, Antonio Coniglio
- Physical review letters
- 2011

We investigate the relaxation process and the dynamical heterogeneities of the kinetically constrained Kob-Andersen lattice glass model and show that these are characterized by different time scales. The dynamics is well described within the diffusing defect paradigm, which suggests that we relate the relaxation process to a reverse-percolation transition.… (More)

- Massimo Pica Ciamarra, Antonio Coniglio
- Physical review letters
- 2008

We measure the number Omega(phi) of mechanically stable states of volume fraction phi of a granular assembly under gravity. The granular entropy S(phi)=logOmega(phi) vanishes both at high density, at phi approximately equal to phi_rcp, and a low density, at phi approximately equal to phi_rvlp, where phi_rvlp is a new lower bound we call random very loose… (More)

The most costly and annoying characteristic of the e-mail communication system is the large number of unsolicited commercial e-mails, known as spams, that are continuously received. Via the investigation of the statistical properties of the spam delivering intertimes, we show that spams delivered to a given recipient are time correlated: if the intertime… (More)

- Massimo Pica Ciamarra, Raffaele Pastore, Antonio Coniglio
- Soft matter
- 2016

Particles in structural glasses rattle around temporary equilibrium positions, that seldom change through a process which is much faster than the relaxation time, known as particle jump. Since the relaxation of the system is due to the accumulation of many such jumps, it could be possible to connect the single particle short time motion to the macroscopic… (More)

- F. Giacco, M. Pica Ciamarra, L. Saggese, L. de Arcangelis, E. Lippiello
- Scientific reports
- 2014

The complexity of the frictional dynamics at the microscopic scale makes difficult to identify all of its controlling parameters. Indeed, experiments on sheared elastic bodies have shown that the static friction coefficient depends on loading conditions, the real area of contact along the interfaces and the confining pressure. Here we show, by means of… (More)

- Raffaele Pastore, Antonio Coniglio, Massimo Pica Ciamarra
- Soft matter
- 2015

The dynamical facilitation scenario, by which localized relaxation events promote nearby relaxation events in an avalanche process, has been suggested as the key mechanism connecting the microscopic and the macroscopic dynamics of structural glasses. Here we investigate the statistical features of this process via numerical simulations of a model structural… (More)