Ponno, A.Ruggiero, José Roberto [UNESP]Drigo Filho, Elso [UNESP]De Luca, J.2014-05-202014-05-202006-05-01Physical Review E. College Pk: American Physical Soc, v. 73, n. 5, 7 p., 2006.1539-3755http://hdl.handle.net/11449/34030We 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.7engArtigo10.1103/PhysRevE.73.056609WOS:000237951400078Acesso abertoWOS000237951400078.pdf3277957413291567