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Gamma II for toric varieties from integrals on T-dual branes and homological mirror symmetry

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arxiv 1903.05300 v1 pith:PIL2ILJ7 submitted 2019-03-13 math.SG

Gamma II for toric varieties from integrals on T-dual branes and homological mirror symmetry

classification math.SG
keywords integralsthimblestoriccharacteristiccyclesfanogammamirror
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abstract

In this paper we consider the oscillatory integrals on Lefschetz thimbles in the Landau-Ginzburg model as the mirror of a toric Fano manifold. We show these thimbles represent the same relative homology classes as the characteristic cycles of the corresponding constructible sheaves under the equivalence of \cite{GPS18-2}. Then the oscillatory integrals on such thimbles are the same as the integrals on the characteristic cycles and relate to genus $0$ Gromov-Witten descendant potential for $X$, and this leads to a proof of Gamma II conjecture for toric Fano manifolds.

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  1. Gamma conjecture II via global Gamma-I

    math.AG 2026-06 unverdicted novelty 7.0

    Proves Gamma conjecture II for del Pezzo surfaces by establishing a global Gamma-I property that propagates from one (SR) point and relating it to non-semisimple cases.