Modified melting crystal model and Ablowitz-Ladik hierarchy

Abstract

This paper addresses the issue of integrable structure in a modified melting crystal model of topological string theory on the resolved conifold. The partition function can be expressed as the vacuum expectation value of an operator on the Fock space of 2D complex free fermion fields. The quantum torus algebra of fermion bilinears behind this expression is shown to have an extended set of "shift symmetries". They are used to prove that the partition function (deformed by external potentials) is essentially a tau function of the 2D Toda hierarchy. This special solution of the 2D Toda hierarchy can be characterized by a factorization problem of $\ZZ\times\ZZ$ matrices as well. The associated Lax operators turn out to be quotients of first order difference operators. This implies that the solution of the 2D Toda hierarchy in question is actually a solution of the Ablowitz-Ladik (equivalently, relativistic Toda) hierarchy. As a byproduct, the shift symmetries are shown to be related to matrix-valued quantum dilogarithmic functions.

latex2e, 33 pages, no figure; (v2) accepted for publication

References in corpus (2)

• Melting Crystal, Quantum Torus and Toda Hierarchy
• Phase transitions, double-scaling limit, and topological strings

Cited by in corpus (10)

• Toda hierarchies and their applications
• Open string amplitudes of closed topological vertex
• Orbifold melting crystal models and reductions of Toda hierarchy
• Generalized Ablowitz-Ladik hierarchy in topological string theory
• Modified melting crystal model and Ablowitz-Ladik hierarchy
• Tau-functions for the Ablowitz--Ladik hierarchy: the matrix-resolvent method
• Cubic Hodge integrals and integrable hierarchies of Volterra type
• 4D limit of melting crystal model and its integrable structure
• Intertwining operator and integrable hierarchies from topological strings
• Enumerative geometry of surfaces and topological strings