Abstract
Predictions of a mode-coupling approximation (MCA) are compared with molecular dynamical simulations of one-dimensional Phi 4-lattice systems with different next-neighbour interaction strengths. In the long-time behaviour the authors find complete disagreement for weak coupling whereas some predictions of the MCA are qualitatively verified in the strong-coupling case, indicating different sources for long-time correlations (local phase space separation or soliton-like solutions of nonlinear differential equations).
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