Understanding the FPU state in FPU-like models
Many papers investigated, in a variety of ways, the so-called "FPU state" in the Fermi-Pasta-Ulam model, namely the state, intermediate Furniture between the initial state and equipartition, that the system soon reaches if initially one or a few long-wavelength normal modes are excited.The FPU state has been observed, in particular, to obey a few c