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• W1587630809 abstract "We consider a finite region of a d-dimensional lattice of nonlinear Hamiltonian rotators, where neighbouring rotators have opposite spins and are coupled by a small potential of order $varepsilon^a,, ageq1/2$. We weakly stochastically perturb the system in such a way that each rotator interacts with its own stochastic Langevin-type thermostat with a force of order $varepsilon$. Then we introduce the action-angle variables for the system of uncoupled rotators ($varepsilon=0$) and note that the sum of actions over all nodes is conserved by the purely Hamiltonian dynamics of the system with $varepsilon>0$. We investigate the limiting (as $varepsilon rightarrow 0$) dynamics of actions for solutions of the $varepsilon$-perturbed system on time intervals of order $varepsilon^{-1}$. It turns out that the limiting dynamics is governed by a certain autonomous (stochastic) equation for the vector of actions. This equation has a completely non-Hamiltonian nature. The $varepsilon$-perturbed system has a unique stationary measure $widetilde mu^varepsilon$ and is mixing. Any limiting point of the family ${widetilde mu^varepsilon}$ of stationary measures as $varepsilonrightarrow 0$ is an invariant measure of the system of uncoupled integrable rotators. There are plenty of such measures. However, it turns out that only one of them describes the limiting dynamics of the $varepsilon$-perturbed system: we prove that a limiting point of ${widetildemu^varepsilon}$ is unique, its projection to the space of actions is the unique stationary measure of the autonomous equation above, which turns out to be mixing, and its projection to the space of angles is the normalized Lebesque measure on the torus $mathbb{T}^N$. Most of results and convergences we obtain are uniform in the number $N$ of rotators." @default.
• W1587630809 created "2016-06-24" @default.
• W1587630809 creator A5050909276 @default.
• W1587630809 date "2014-03-05" @default.
• W1587630809 modified "2023-09-27" @default.
• W1587630809 title "Statistical mechanics of nonequilibrium systems of rotators with alternated spins" @default.
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• W1587630809 hasPublicationYear "2014" @default.
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