Sometimes it is more convenient to store excess energy in a small region of space rather than spreading it over all the available volume. This may happen when the evolution of a system is characterized by additional dynamic constraints that promote energy localization for entropic reasons.
In this seminar I will discuss the role of peculiar nonlinear excitations (discrete breathers) for the localization process in networks of coupled oscillators.
Particular attention will be devoted to the dynamics of a Discrete Nonlinear Schroedinger Equation which exhibits a metastable phase with a finite density of breathers and partial energy localization.
Such state persists over very long (astronomical) times as a consequence of the extremely low interaction of these excitations with the surrounding background.
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Date & time: 19/04/2016 at 11:30.
Location: Room P3.10, Mathematics Building, Instituto Superior Técnico, Lisbon.