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- T S Grigera, V Martín-Mayor, G Parisi, P Verrocchio
- Nature
- 2003

Glasses are amorphous solids, in the sense that they display elastic behaviour. In crystalline solids, elasticity is associated with phonons, which are quantized vibrational excitations. Phonon-like excitations also exist in glasses at very high (terahertz; 10(12) Hz) frequencies; surprisingly, these persist in the supercooled liquids. A universal feature… (More)

- L A Fernández, V Martín-Mayor, P Verrocchio
- Physical review letters
- 2007

The phase diagram of soft spheres with size dispersion is studied by means of an optimized Monte Carlo algorithm which allows us to equilibrate below the kinetic glass transition for all size distributions. The system ubiquitously undergoes a first-order freezing transition. While for a small size dispersion the frozen phase has a crystalline structure,… (More)

- L A Fernández, V Martín-Mayor, B Seoane, P Verrocchio
- Physical review. E, Statistical, nonlinear, and…
- 2010

We study a polydisperse soft-spheres model for colloids by means of microcanonical Monte Carlo simulations. We consider a polydispersity as high as 24%. Although solidification occurs, neither a crystal nor an amorphous state are thermodynamically stable. A finite size scaling analysis reveals that in the thermodynamic limit: (a) the fluid-solid transition… (More)

- Roberto Bergamini, Paolo Sedici, Paolo Verrocchio
- 1996

The influence of Inflation on initial (i.e. at Planck's epoch) large anisotropy of the Universe is studied. To this end we consider a more general metric than the isotropic one: the locally rotationally symmetric (L.R.S.) Bianchi IX metric. We find, then, a large set of initial conditions of intrinsic curvature and shear allowing an inflationary epoch that… (More)

- Vincenza Crupi, Domenico Majolino, +6 authors Rosanna Stancanelli
- The journal of physical chemistry. A
- 2010

The vibrational dynamics of solid inclusion complexes of the nonsteroidal anti-inflammatory drug Ibuprofen (IBP) with beta-cyclodextrin (beta-CD) and methyl-beta-cyclodextrin (Me-beta-CD) has been investigated by using attenuated total reflection-Fourier transform infrared FTIR-ATR spectroscopy, in order to monitor the changes induced, as a consequence of… (More)

- Andrea Cavagna, Tomás S Grigera, Paolo Verrocchio
- Physical review letters
- 2007

According to the mosaic scenario, relaxation in supercooled liquids is ruled by two competing mechanisms: surface tension, opposing the creation of local excitations, and entropy, providing the drive to the configurational rearrangement of a given region. We test this scenario through numerical simulations well below the Mode Coupling temperature. For an… (More)

- Giacomo Gradenigo, Roberto Trozzo, Andrea Cavagna, Tomás S Grigera, Paolo Verrocchio
- The Journal of chemical physics
- 2013

The problem of measuring nontrivial static correlations in deeply supercooled liquids made recently some progress thanks to the introduction of amorphous boundary conditions, in which a set of free particles is subject to the effect of a different set of particles frozen into their (low temperature) equilibrium positions. In this way, one can study the… (More)

- Barbara Rossi, Paolo Verrocchio, Gabriele Viliani, Giorgina Scarduelli, Graziano Guella, Ines Mancini
- The Journal of chemical physics
- 2006

Vibrational properties of inclusion complexes with cyclodextrins are studied by means of Raman spectroscopy and numerical simulation. In particular, Raman spectra of the nonsteroidal, anti-inflammatory drug indomethacin undergo notable changes in the energy range between 1600 and 1700 cm(-1) when inclusion complexes with cyclodextrins are formed. By using… (More)

- Chiara Cammarota, Andrea Cavagna, Giacomo Gradenigo, Tomas S Grigera, Paolo Verrocchio
- The Journal of chemical physics
- 2009

There is a certain consensus that the very fast growth of the relaxation time tau occurring in glass-forming liquids on lowering the temperature must be due to the thermally activated rearrangement of correlated regions of growing size. Even though measuring the size of these regions has defied scientists for a while, there is indeed recent evidence of a… (More)

- L A Fernández, V Martín-Mayor, P Verrocchio
- Physical review. E, Statistical, nonlinear, and…
- 2006

We show numeric evidence that, at low enough temperatures, the potential energy density of a glass-forming liquid fluctuates over length scales much larger than the interaction range. We focus on the behavior of translationally invariant quantities. The growing correlation length is unveiled by studying the finite-size effects. In the thermodynamic limit,… (More)