Long-time Anderson Localization for the Nonlinear quasi-periodic Schrödinger Equation on ${\mathbb{Z}}^d$

Hongzi Cong, Yunfeng Shi, W. -M. Wang

Using a Birkhoff normal form transform to impede mode transfer in a finite "barrier", we prove localization of arbitrary ${\ell }^2$ data for polynomially long time for the nonlinear…