Topological-Antitopological Fusion and the Large N CP^N Model

M. Bourdeau, M. R. Douglas

We discuss the large $N$ limit of the supersymmetric $C{P}^N$ models as an illustration of Cecotti and Vafa's $t{t}^{\ast }$ formalism. In this limit the `$t{t}^{\ast }$ equation' becomes the long w…