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- W4328125425 abstract "We study the transition from integrability to chaos for the three-particle Fermi–Pasta–Ulam–Tsingou (FPUT) model. We can show that both the quartic β-FPUT model (α=0) and the cubic one (β=0) are integrable by introducing an appropriate Fourier representation to express the nonlinear terms of the Hamiltonian. For generic values of α and β, the model is non-integrable and displays a mixed phase space with both chaotic and regular trajectories. In the classical case, chaos is diagnosed by the investigation of Poincaré sections. In the quantum case, the level spacing statistics in the energy basis belongs to the Gaussian orthogonal ensemble in the chaotic regime, and crosses over to Poissonian behavior in the quasi-integrable low-energy limit. In the chaotic part of the spectrum, two generic observables obey the eigenstate thermalization hypothesis." @default.
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- W4328125425 date "2023-03-21" @default.
- W4328125425 modified "2023-09-30" @default.
- W4328125425 title "Quantization of Integrable and Chaotic Three-Particle Fermi–Pasta–Ulam–Tsingou Models" @default.
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- W4328125425 doi "https://doi.org/10.3390/e25030538" @default.
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