Gromov-Witten invariants of ${\mathbb{P}}^1$ coupled to a KdV tau function

Paul Norbury

We consider the pull-back of a natural sequence of cohomology classes ${\Theta }_{g,n}\in H^{2(2g-2+n)}({\overline{\mathcal{M}}}_{g,n})$ to the moduli space of stable maps ${\cal M}^g_n(\mathbb{P…