2003/10/31 by Michael Kastner, Jacques-Alexandre Sepulchre
Physics and Astronomy · #nlin.PS #cond-mat
published as Discrete and Continuous Dynamical Systems B 5, 719-734 (2005) · 15 pages, 4 figures
arxiv created 2005/05/17 · arxiv updated 2009/12/01
For the Fermi-Pasta-Ulam chain, an effective Hamiltonian is constructed, describing the motion of approximate, weakly localized discrete breathers traveling along the chain. The velocity of these moving and localized vibrations can be estimated analytically as the group velocity of the corresponding wave packet. The Peierls-Nabarro barrier is estimated for strongly localized discrete breathers.