Gromov--Witten Theory of CP^1 and Integrable Hierarchies

Details Gromov--Witten Theory of CP^1 and Integrable Hierarchies Gromov--Witten Theory of CP^1 and Integrable Hierarchies

2006-04-29

arxiv.org/abs/math-ph/0605001v1

Physics

Mathematical Physics

22 pages, this is the second part of an earlier version, major revision of the exposition

Scientific paper

The ancestor Gromov--Witten invariants of a compact {\Kahler} manifold $X$ can be organized in a generating function called the total ancestor potential of $X$. In this paper, we construct Hirota Quadratic Equations (HQE shortly) for the total ancestor potential of $\C P^1$. The idea is to adopt the formalism developed in \cite{G1,GM} to the mirror model of $\C P^1$. We hope that the ideas presented here can be generalized to other manifolds as well. As a corollary, using the twisted loop group formalism from \cite{G3}, we obtain a new proof of the following version of the Toda conjecture: the total descendant potential of $\C P^1$ (known also as the partition function of the $\C P^1$ topological sigma model) is a tau-function of the Extended Toda Hierarchy.

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