Additional symmetries of the extended bigraded Toda hierarchy
Abstract
The extended bigraded Toda hierarchy (EBTH) is an integrable system satisfied by the total descendant potential of CP1 with two orbifold points. We construct additional symmetries of the EBTH and describe explicitly their action on the Lax operator, wave operators, and tau-function of the hierarchy. In particular, we obtain infinitesimal symmetries of the EBTH that act on the tau-function as a subalgebra of the Virasoro algebra, generalizing those of Dubrovin and Zhang.
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