Energy localization in the Phi(4) oscillator chain
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/05/2006
|
Resumo |
We study energy localization in a finite one-dimensional Phi(4) oscillator chain with initial energy in a single oscillator of the chain. We numerically calculate the effective number of degrees of freedom sharing the energy on the lattice as a function of time. We find that for energies smaller than a critical value, energy equipartition among the oscillators is reached in a relatively short time. on the other hand, above the critical energy, a decreasing number of particles sharing the energy is observed. We give an estimate of the effective number of degrees of freedom as a function of the energy. Our results suggest that localization is due to the appearance, above threshold, of a breather-like structure. Analytic arguments are given, based on the averaging theory and the analysis of a discrete nonlinear Schrodinger equation approximating the dynamics, to support and explain the numerical results. |
Formato |
7 |
Identificador |
http://dx.doi.org/10.1103/PhysRevE.73.056609 Physical Review E. College Pk: American Physical Soc, v. 73, n. 5, 7 p., 2006. 1539-3755 http://hdl.handle.net/11449/34030 10.1103/PhysRevE.73.056609 WOS:000237951400078 WOS000237951400078.pdf |
Idioma(s) |
eng |
Publicador |
American Physical Soc |
Relação |
Physical Review E |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |