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INdAM Fellowship Programs in Mathematics and/or Applications cofunded by Marie Skłodowska-Curie Actions

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Chaozhong Wu

INdAM-COFUND Incoming fellow between 2012-01-10 and 2014-01-09

Project information


Tau Functions of Integrable Systems and their Applications

Partner organisation

Scuola Internazionale Superiore di Studi Avanzati

via Bonomea, 265
34136 Trieste, Italy


Tau function is a significant concept in the theoryof integrable systems and their applications in relevant researchareas of mathematical physics such like topological field theory,Gromov-Witten invariants and singularity theory. In this proposal we study tau functions of certain integrable systems and theirapplications.

Our key objective is a uniform definition of the tafunctions of all Drinfeld-Sokolov hierarchies, which are Hamiltonian systems associated to affine Kac-Moody algebras and have several equivalent versions in different contexts. Up to now, tau functions of these hierarchies have been considered separately in some particular cases. We plan to define tau functions of Drinfeld-Sokolov hierarchies by using appropriate tau-symmetric Hamiltonian densities, which is independent of representations of the Kac-Moody algebras. Such a definition is crucial in both the theory of integrable systems and their applications.

Furthermore we will investigate Virasoro symmetries acting on the tau function of the Drinfeld-Sokolov hierarchies. Such actions could be linear or nonlinear, and the corresponding tau function may have rich geometric illustrations. Progress in this direction will resolve a conjecture raised by B. Dubrovin and Y. Zhang for topological hierarchies associated to semisimple Frobenius manifold for Coxeter groups of ADE type. Moreover, it probably gives hint to generate the previous integrable-system method for semisimple Gromov-Witten invariants.

Fellow information

Previous positions, awards

  • 2011-2012: Research project “On certain integrable
    hierarchies related to Gromov-Witten invariants” supported by
    specific funding under the “Young SISSA Scientists’ Research
    Projects” scheme
  • 11 October 2010 – 10 January 2012: Post doctor, SISSA, Trieste, Italy
  • 3 September 2008 – 24 February 2009: Visitor, SISSA, Trieste, Italy
  • 1 September 2005 – 20 July 2010: PhD student, Department of Mathematical
    Sciences, Tsinghua University, Beijing, P.R. China
  • 1 September 2001 – 15 July 2005: Bachelor degree, Department of Mathematical
    Sciences, Tsinghua University

Publications, preprints, other works

  1. Chao-Zhong Wu, Tau functions and Virasoro symmetries for Drinfeld – Sokolov hierarchies, preprint (2012); arXiv:1203.5750
  2. Chao-Zhong Wu, From additional symmetries to linearization of Virasoro symmetries, preprint (2011); arXiv:1112.0246
  3. Chao-Zhong Wu, $R$-matrices and Hamiltonian structures for certain Lax equations, preprint (2010); arXiv:1012.5245
  4. Chao-Zhong Wu, Dingdian Xu, A class of infinite-dimensional Frobenius manifolds and their submanifolds, Intern. Math. Res. Notices (2011); DOI:10.1093/imrn/rnr192
  5. Si-Qi Liu, Chao-Zhong Wu and Youjin Zhang, On the Drinfeld – Sokolov hierarchies of $D$ type, Int. Math. Res. Not. IMRN 2011, no. 8, 1952–1996
  6. Chao-Zhong Wu and Dingdian Xu, Bihamiltonian structure of the two-component Kadomtsev-Petviashvili hierarchy of type B, J. Math. Phys. 51 (2010), 063504
  7. Chao-Zhong Wu, A remark on Kac-Wakimoto hierarchies of D-type, J. Phys. A: Math. Theor. 43 (2010), 035201
  8. Si-Qi Liu, Chao-Zhong Wu and Youjin Zhang, On properties of Hamiltonian structures for a class of evolutionary PDEs, Lett. Math. Phys. 84 (2008), 47-63
  9. Chao-Zhong Wu, On solutions of the two-component Camassa-Holm system, J. Math. Phys. 47 (2006), 083513

Conferences, schools, other events

  • Contemporary Ways Of Integrability, A Workshop for
    Young Researchers in Integrable Systems and their Ramifications

    Lisbon, Complexo Interdisciplinar da Universidade
    de Lisboa, 16-19 May 2012

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