Tau Functions and Virasoro Symmetries for Drinfeld-Sokolov Hierarchies

Chao-Zhong Wu

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arXiv · 1203.5750

Tau Functions and Virasoro Symmetries for Drinfeld-Sokolov Hierarchies

Chao-Zhong Wu

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Abstract

For each Drinfeld-Sokolov integrable hierarchy associated to affine Kac-Moody algebra, we obtain a uniform construction of tau function by using tau-symmetric Hamiltonian densities, moreover, we represent its Virasoro symmetries as linear/nonlinear actions on the tau function. The relations between the tau function constructed in this paper and those defined for particular cases of Drinfeld-Sokolov hierarchies in the literature are clarified. We also show that, whenever the affine Kac-Moody algebra is simply-laced or twisted, the tau functions of the Drinfeld-Sokolov hierarchy coincide with the solutions of the corresponding Kac-Wakimoto hierarchy from the principal vertex operator realization of the affine algebra.

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Chao-Zhong Wu. 2014-05-20. Tau Functions and Virasoro Symmetries for Drinfeld-Sokolov Hierarchies. https://arxiv.org/abs/1203.5750

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