Tau Functions and the Limit of Block Toeplitz Determinants - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Mathematics Research Notices Année : 2015

Tau Functions and the Limit of Block Toeplitz Determinants

Chao-Zhong Wu
  • Fonction : Auteur

Résumé

A classical way to introduce tau functions for integrable hierarchies of solitonic equations is by means of the Sato–Segal–Wilson infinite-dimensional Grassmannian. Every point in the Grassmannian is naturally related to a Riemann–Hilbert problem on the unit circle, for which Bertola proposed a tau function that generalizes the Jimbo–Miwa–Ueno tau function for isomonodromic deformation problems. In this paper, we prove that the Sato–Segal–Wilson tau function and the (generalized) Jimbo–Miwa–Ueno iso- monodromic tau function coincide under a very general setting, by identifying each of them to the large-size limit of a block Toeplitz determinant. As an application, we give a new definition of tau function for Drinfeld–Sokolov hierarchies (and their generalizations) by means of infinite-dimensional Grassmannians, and clarify their relation with other tau functions given in the literature

Dates et versions

hal-01392114 , version 1 (04-11-2016)

Identifiants

Citer

Mattia Cafasso, Chao-Zhong Wu. Tau Functions and the Limit of Block Toeplitz Determinants. International Mathematics Research Notices, 2015, 2015 (20), pp.10339-10366. ⟨10.1093/imrn/rnu262⟩. ⟨hal-01392114⟩
233 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More