## Abstract

A family of polynomial τ-functions for the NLS-Toda hierarchy is constructed. The hierarchy is associated with the homogeneous vertex operator representation of the affine algebra g of type A^{(1)}_{1}. These τ-functions are given explicitly in terms of Schur functions that correspond to rectangular Young diagrams. It is shown that an arbitrary polynomial τ-function which is an eigenvector of d, the degree operator of g, is contained in the family. By the construction, any τ-function in the family becomes a Virasoro singular vector. This consideration gives rise to a simple proof of known results on the Fock representation of the Virasoro algebra with c = 1.

Original language | English |
---|---|

Pages (from-to) | 147-156 |

Number of pages | 10 |

Journal | Letters in Mathematical Physics |

Volume | 60 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2002 May |

Externally published | Yes |

## Keywords

- Nonlinear Schrödinger equation
- Schur functions
- Virasoro algebra

## ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Mathematical Physics