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UMR 5672

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You are here: Home / Seminars / Colloquium / Enrico Fermi and the birth of modern nonlinear wave physics

Enrico Fermi and the birth of modern nonlinear wave physics

Miguel Onorato (Università di Torino)
When Sep 28, 2020
from 11:00 to 12:00
Where Web seminar
Attendees Miguel Onorato
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In the early fifties in Los Alamos E. Fermi in collaboration with J. Pasta, S. Ulam and M. Tsingou investigated a one dimensional chain of equal masses connected by a weakly nonlinear spring. The key question was related to the understanding of the phenomenon of conduction in solids; in particular they wanted to estimate the time needed to reach a statistical equilibrium state characterized by the equipartition of energy among the Fourier modes. They approached the problem numerically using the MANIAC I computer; however, the system did not thermalize and they observed a recurrence to the initial state (this is known as the FPUT-recurrence). This unexpected result has led to the development of modern nonlinear physics (discovery of solitons and integrability).

In this seminar, I will give an historical overview of the subject and present new results on the problem of thermalization based on the Wave Turbulence Theory.

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