Abstract :
The partition function of DN+1 topological string, the coupled system of topological gravity and DN+1 topological minimal matter, is proposed in the framework of KP hierarchy. It is specified by the elements of GL(∞) which constitute the deformed family from the A2N−1 topological string. Its dispersionless limit is investigated from the view of both dispersionless KP hierarchy and singularity theory. In particular the free energy restricted on the small phase space coincides with that for the topological Landau-Ginzburg model of type DN+1.
