Conservation laws, bright matter wave solitons and modulational instability of nonlinear Schrِdinger equation with time-dependent nonlinearity

In this paper, we consider a general form of nonlinear Schrِdinger equation with time-dependent nonlinearity. Based on the linear eigenvalue problem, the complete integrability of such nonlinear Schrِdinger equation is identified by admitting an infinite number of conservation laws. Using the Darboux transformation method, we obtain some explicit bright multi-soliton solutions in a recursive manner. The propagation characteristic of solitons and their interactions under the periodic plane wave background are discussed. Finally, the modulational instability of solutions is analyzed in the presence of small perturbation.