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We investigate the equilibration process of the strongly coupled quarticFermi-Pasta-Ulam-Tsingou (FPUT) model by adding Langevin baths to the ends ofthe chain. The time evolution of the system is investigated by means ofextensive numerical simulations and shown to match the results expected fromequilibrium statistical mechanics in the time-asymptotic limit. Upon increasingthe nonlinear coupling, the thermalization of the energy spectrum displays anincreasing asymmetry in favour of small-scale, high-frequency modes, whichrelax significantly faster than the large-scale, low-frequency ones. The globalequilibration time is found to scale linearly with system size and shown toexhibit a power-law decay with the strength of the nonlinearity andtemperature. Nonlinear interaction adds to energy distribution among modes,thus speeding up the thermalization process.

Nonlinearity accelerates the thermalization of the quartic FPUT model with stochastic baths