The Analysis and PDE seminar will take place Monday Oct 1st in 740 Evans from 4-5pm.

**Title:**Construction of unstable quasi-periodic solutions for a system of coupled NLS equations.

**Abstract:**The systems of coupled NLS equations occur in some physical problems, in particular in nonlinear optics (coupling between two optical waveguides, pulses or polarized components…). From the mathematical point of view, the coupling effects can lead to truly nonlinear behaviors, such as the beating effect (solutions with Fourier modes exchanging energy) of Grébert, Paturel and Thomann (2013).