Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Gangemi, Roberto"'
General features of the $\alpha-\beta$ transition of quartz are investigated. Molecular dynamics methods are mainly used, an analytic treatment being deferred to a work in preparation. A basic preliminary observation is that the transition involves o
Externí odkaz:
http://arxiv.org/abs/2307.13411
We report the results of a numerical investigation, performed in the frame of dynamical systems' theory, for a realistic model of a ionic crystal for which, due to the presence of long--range Coulomb interactions, the Gibbs distribution is not well d
Externí odkaz:
http://arxiv.org/abs/2008.00712
According to the correspondence principle, classical mechanics and quantum mechanics agree in the semiclassical limit, although presently it has become more and more clear how intriguing would be to try to fix a boundary between them. Here we give a
Externí odkaz:
http://arxiv.org/abs/1912.07933
In Statistical Mechanics, Tsallis distributions were apparently conceived in connection with systems presenting long--range interactions. In fact, they were observed in numerical computations for models of such a type, as occurring in the approach to
Externí odkaz:
http://arxiv.org/abs/1910.00255
It is well known that Gibbs' statistical mechanics is not justified for systems presenting long-range interactions, such as plasmas or galaxies. In a previous work we considered a realistic FPU-like model of an ionic crystal (and thus with long-range
Externí odkaz:
http://arxiv.org/abs/1903.02272
It was recently shown that the experimental infrared spectra of ionic crystals at room temperature are very well reproduced by classical realistic models, and here new results are reported on the temperature dependence of the spectra, for the LiF cry
Externí odkaz:
http://arxiv.org/abs/1804.00438
Publikováno v:
Journal of Statistical Physics; Oct2024, Vol. 191 Issue 10, p1-16, 16p
Publikováno v:
In Physica A: Statistical Mechanics and its Applications 15 January 2022 586
This paper is concerned with theoretical estimates of the refractive--index curves for quartz, obtained by the Kubo formul\ae\ in the classical approximation, through MD simulations for the motions of the ions. Two objectives are considered. The firs
Externí odkaz:
http://arxiv.org/abs/1609.01957
Agreement of classical Kubo theory with the infrared dispersion curves $n(\omega)$ of ionic crystals
The theoretical dispersion curves $n(\omega)$ (refractive index versus frequency) of ionic crystals in the infrared domain are expressed, within the Green--Kubo theory, in terms of a time correlation function involving the motion of the ions only. Th
Externí odkaz:
http://arxiv.org/abs/1503.08975