A note on blow-up phenomena for mass critical nonlinear Schrِdinger equation

In this paper, we mainly discuss the radial case for L 2 critical nonlinear Schrِdinger equation with finite blow-up time. We describe that the solution may concentrate some points with different speeds. Furthermore, we give further research to the conjecture given by F. Merle and P. Raphael (2005) in [13] and we proved the conjecture for some cases.