Asymptotic Dynamics of Breathers in Fermi-Pasta-Ulam Chains
  We study the asymptotic dynamics of breathers in finite Fermi-Pasta-Ulam chains at zero and non-zero temperatures. While such breathers are essentially stationary and very long-lived at zero temperature, thermal fluctuations tend to lead to breather motion and more rapid decay. 
R. Reigada, A. Sarmiento, and Katja Lindenberg