UNSPECIFIED. (2002) Effective Hamiltonian for travelling discrete breathers. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 35 (18). pp. 3985-4002. ISSN 0305-4470

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Abstract

Hamiltonian chains of oscillators in general probably do not sustain exact travelling discrete breathers. However solutions which look like moving discrete breathers for some time are not difficult to observe in numerics. In this paper we propose an abstract framework for the description of approximate travelling discrete breathers in Hamiltonian chains of oscillators. The method is based on the construction of an effective Hamiltonian enabling one to describe the dynamics of the translation degree of freedom of moving breathers. Error estimate on the approximate dynamics is also studied. The concept of the Peierls-Nabarro barrier can be made clear in this framework. We illustrate the method with two simple examples, namely the Salerno model which interpolates between the Ablowitz-Ladik lattice and the discrete nonlinear Schrodinger system, and the Fermi-Pasta-Ulam chain.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
Publisher:	IOP PUBLISHING LTD
ISSN:	0305-4470
Date:	10 May 2002
Volume:	35
Number:	18
Number of Pages:	18
Page Range:	pp. 3985-4002
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10875

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