Creating and sharing knowledge for telecommunications

Breathers and metastable states in the Discrete Nonlinear Schroedinger Equation


on 19-04-2016

...

Stefano Iubini (CNRS Orléans)

Date & time: 19/04/2016 at 11:30.

Location: Room P3.10, Mathematics Building, Instituto Superior Técnico, Lisbon.
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.

Physics of Information Seminar
http://www.phys-info.org/physics-of-information-seminar.html

Supported with funding from FCT, FEDER and EU FP7, namely via projects PEst-OE/EEI/LA0008/2013, UID/EEA/50008/2013, IT/QuSim, CQVibes, Landauer (318287) and PAPETS (323901).