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arXiv · 1801.03282

The effect of long-range interactions on the dynamics and statistics of 1D Hamiltonian lattices with on-site potential

H. Christodoulidi·T. Bountis·L. Drossos
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Abstract

We examine the role of long--range interactions on the dynamical and statistical properties of two 1D lattices with on--site potentials that are known to support discrete breathers: the Klein--Gordon (KG) lattice which includes linear dispersion and the Gorbach--Flach (GF) lattice, which shares the same on--site potential but its dispersion is purely nonlinear. In both models under the implementation of long--range interactions (LRI) we find that single--site excitations lead to special low--dimensional solutions, which are well described by the undamped Duffing oscillator. For random initial conditions we observe that the maximal Lyapunov exponent $λ$ %: (a) tends to a positive value for KG and grows like $\varepsilon^(.25)$ for GF as the energy density $\varepsilon=E/N$ increases; (b) saturates to a positive value as the number of particles $N$ increase, scales as $N^{-0.12}$ in the KG model and as $N^{-0.27}$ in the GF with LRI, suggesting in that case an approach to integrable behavior towards the thermodynamic limit. Furthermore, under LRI, their non-Gaussian momentum distributions are distinctly different from those of the FPU model.

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H. Christodoulidi, T. Bountis, L. Drossos. 2018-04-15. The effect of long-range interactions on the dynamics and statistics of 1D Hamiltonian lattices with on-site potential. https://doi.org/10.1140/epjst%2Fe2018-00003-9

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