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arXiv · 2611.09287

Thermalization of coarse-grained variables in the Toda lattice: a numerical study

Martina Giachello·Cesare Vianello·Giacomo Gradenigo
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Abstract

We present here a numerical study of the Toda lattice Hamiltonian dynamics showing how, despite model integrability, it is possible to find many macroscopic observables which display standard equilibrium behavior. In particular, we study numerically the energy time correlation of certain coarse-grained variables, showing that it decays with either exponential or stretched exponential behaviour, thus indicating good thermalization properties. The spirit of our observation is complementary to that of standard Fermi-Pasta-Ulam-Tsingou-like numerical experiments, in which the breaking of integrability is regarded as the key ingredient for relaxation to thermal equilibrium. The present communication corroborates, on the contrary, the view that integrability is not an obstacle to thermalization, provided that a sufficiently weak definition of the latter is accepted. In the Toda lattice we have introduced several kinds of coarse-grained variables, constructed with the purpose to maintain a thermodynamic relevance also for large system sizes, which all show good thermalization properties.

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Martina Giachello, Cesare Vianello, Giacomo Gradenigo. 2026-11-06. Thermalization of coarse-grained variables in the Toda lattice: a numerical study. https://arxiv.org/abs/2611.09287

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