Articolo in rivista, 2017, ENG, 10.1103/PhysRevE.95.043203

Multiparticle collision simulations of two-dimensional one-component plasmas: Anomalous transport and dimensional crossovers

Di Cintio P.; Livi R.; Lepri S.; Ciraolo G.

Consiglio Nazionale Delle Ricerche, Istituto di Fisica Applicata Nello Carrara, via Madonna del piano 10, Sesto Fiorentino, I-50019, , , Italy; Consiglio Nazionale Delle Ricerche, Istituto di Fisica Applicata Nello Carrara, via Madonna del piano 10, Sesto Fiorentino, I-50019, , , Italy; Dipartimento di Fisica e Astronomia, CSDC, Universitá di Firenze, via G. Sansone 1, Sesto Fiorentino, I-50019, , Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, via G. Sansone 1, Sesto Fiorentino, I-50019, , Italy; Consiglio Nazionale Delle Ricerche, Istituto Dei Sistemi Complessi, via Madonna del piano 10, Sesto Fiorentino, I-50019, , Italy; CEA, IRFM, Saint-Paul-lez-Durance, F-13108, , France

By means of hybrid multiparticle collsion-particle-in-cell (MPC-PIC) simulations we study the dynamical scaling of energy and density correlations at equilibrium in moderately coupled two-dimensional (2D) and quasi-one-dimensional (1D) plasmas. We find that the predictions of nonlinear fluctuating hydrodynamics for the structure factors of density and energy fluctuations in 1D systems with three global conservation laws hold true also for 2D systems that are more extended along one of the two spatial dimensions. Moreover, from the analysis of the equilibrium energy correlators and density structure factors of both 1D and 2D neutral plasmas, we find that neglecting the contribution of the fluctuations of the vanishing self-consistent electrostatic fields overestimates the interval of frequencies over which the anomalous transport is observed. Such violations of the expected scaling in the currents correlation are found in different regimes, hindering the observation of the asymptotic scaling predicted by the theory.

Physical review. E, Statistical, nonlinear and soft matter physics (Online) 95 (4), pp. 043203-1–043203-12

Keywords

anomalous transport and relaxation, statistical mechanics of out-of-equilibrium processes

CNR authors

Livi Roberto, Di Cintio Pierfrancesco, Lepri Stefano

CNR institutes

IFAC – Istituto di fisica applicata "Nello Carrara", ISC – Istituto dei sistemi complessi