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31 papers · 1 filter
Matrix controlled channel diffusion of sodium in amorphous silica
E. Sunyer, P. Jund, R. Jullien
To find the origin of the diffusion channels observed in sodium-silicate glasses, we have performed classical molecular dynamics simulations of NaO--4SiO during which the m…
Methyl group dynamics in a confined glass
A. J. Moreno, J. Colmenero, A. Alegría +4
We present a neutron scattering investigation on methyl group dynamics in glassy toluene confined in mesoporous silicates of different pore sizes. The experimental results have bee…
Cosmological Deformation of Lorentzian Spin Foam Models
Karim Noui, Philippe Roche
We study the quantum deformation of the Barrett-Crane Lorentzian spin foam model which is conjectured to be the discretization of Lorentzian Plebanski model with positive cosmologi…
The first cohomology group of the trivial extension of a monomial algebra
Claude Cibils, Maria Julia Redondo, Manuel Saorin
Given a finite--dimensional monomial algebra we consider the trivial extension and provide formulae, depending on the characteristic of the field, for the dimensions of th…
Scalar mesons in QCD and tests of the gluon content of the sigma
Stephan Narison
We summarize the different features of the scalar mesons from QCD spectral sum rule analyses of the two- and three-point functions. The results do not favour the u-bar u + d-bar d…
The vibrational dynamics of vitreous silica: Classical force fields vs. first-principles
Magali Benoit, Walter Kob
We compare the vibrational properties of model SiO_2 glasses generated by molecular-dynamics simulations using the effective force field of van Beest et al. (BKS) with those obtain…