SPACE-TIME ANALYTIC SMOOTHING EFFECT FOR THE NONLINEAR SCHRO•DINGER EQUATIONS WITH NONLINEARITY OF EXPONENTIAL TYPE

In this paper, we consider the global Cauchy problem for the nonlinear Schrodinger equations with nonlinearity of exponential type in higher space dimensions n = 2. In particular, we study the global existence of the solutions to the Cauchy problem with small data in the framework of intersection of Sobolev and weighted Lebesgue space: H-n/2 nFH(n/2). More precisely, we show that if data decay exponentially in H-n/2 nFH(n/2) then for any time t? 0, solutions are real-analytic in both space and time variables and have analytic continuation.