%0 Journal Article
%A Bonilla, Luis L.
%A Prados, Antonio
%A Carpio Rodríguez, Ana María
%T Nonequilibrium dynamics of a fast oscillator coupled to Glauber spins
%D 2010
%@ 1742-5468
%U https://hdl.handle.net/20.500.14352/42112
%X A fast harmonic oscillator is linearly coupled with a system of Ising spins that are in contact with a thermal bath, and evolve under a slow Glauber dynamics at dimensionless temperature theta. The spins have a coupling constant proportional to the oscillator position. The oscillator spin interaction produces a second order phase transition at theta = 1 with the oscillator position as its order parameter: the equilibrium position is zero for theta > 1 and nonzero for theta < 1. For theta < 1, the dynamics of this system is quite different from relaxation to equilibrium. For most initial conditions, the oscillator position performs modulated oscillations about one of the stable equilibrium positions with a long relaxation time. For random initial conditions and a sufficiently large spin system, the unstable zero position of the oscillator is stabilized after a relaxation time proportional to theta. If the spin system is smaller, the situation is the same until the oscillator position is close to zero, then it crosses over to a neighborhood of a stable equilibrium position about which it keeps oscillating for an exponentially long relaxation time. These results of stochastic simulations are predicted by modulation equations obtained from a multiple scale analysis of macroscopic equations.
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