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Phys. Rev. E 66, 046607 (2002) [6 pages]

Asymptotic dynamics of breathers in Fermi-Pasta-Ulam chains

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R. Reigada*, A. Sarmiento†, and Katja Lindenberg
Department of Chemistry and Biochemistry and Institute for Nonlinear Science, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0340

Received 14 May 2002; revised 23 July 2002; published 10 October 2002

We carry out a numerical study of the asymptotic dynamics of breathers in finite Fermi-Pasta-Ulam chains at zero and nonzero temperatures. While at zero temperature such breathers remain essentially stationary and decay extremely slowly over wide parameter ranges, thermal fluctuations tend to lead to breather motion and more rapid decay. In both cases the decay is essentially exponential over long time intervals.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevE.66.046607
DOI:
10.1103/PhysRevE.66.046607
PACS:
05.40.-a, 05.45.-a, 63.20.Pw

*Permanent address: Departament de Química Física, Universitat de Barcelona, Avda. Diagonal 647, 08028 Barcelona, Spain.

†Permanent address: Instituto de Matemáticas, Universidad Nacional Autónoma de México, Ave. Universidad s/n, 62200 Chamilpa, Morelos, Mexico.

 
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