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The index theorem of lattice Wilson--Dirac operators via higher index theory

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arxiv 2009.03570 v1 pith:3XOQ66VW submitted 2020-09-08 math-ph math.KTmath.MP

classification math-phmath.KTmath.MP
keywords indexlatticewilson--dirachigheroperatoroperatorsprooftheorem
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We give a proof of the index theorem of lattice Wilson--Dirac operators, which states that the index of a twisted Dirac operator on the standard torus is described in terms of the corresponding lattice Wilson--Dirac operator. Our proof is based on the higher index theory of almost flat vector bundles.

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  1. $\eta$ invariant of massive Wilson Dirac operator and the index

    hep-lat 2025-01 conditional novelty 4.0 of 10

    The massive Wilson Dirac operator's eta invariant equals the continuum Dirac index on flat tori at sufficiently small lattice spacing, via K-theory.

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