Anderson Localization for Time Periodic Random Schr\"odinger operators
  We prove that at large disorder, Anderson localization in $\Z^d$ is stable under localized time-periodic perturbations by proving that the associated quasi-energy operator has pure point spectrum. The formulation of this problem is motivated by questions of Anderson localization for non-linear Schr\"odinger equations. 
Avy Soffer, Wei-Min Wang