On the extended resolvent of the nonstationary Schrödinger operator for a Darboux transformed potential

In the framework of the resolvent approach, a so-called twisting operator is introduced that is able, at the same time, to superimpose a la Darboux N solitons to a generic smooth decaying potential of the nonstationary Schrodinger operator and to generate the corresponding Jost solutions. This twisting operator is also used to construct an explicit bilinear representation in terms of the Jost solutions of the related extended resolvent. The main properties of the Jost and auxiliary Jost solutions and of the resolvent are discussed.