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Knots and Their Related q-Series

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arxiv 2304.09377 v2 pith:F7T2ZJPG submitted 2023-04-19 math.GT hep-th

Knots and Their Related q-Series

classification math.GT hep-th
keywords matrix-valuedanalyticcocyclefunctionsholomorphicinvariantknotknots
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss a matrix of periodic holomorphic functions in the upper and lower half-plane which can be obtained from a factorization of an Andersen-Kashaev state integral of a knot complement with remarkable analytic and asymptotic properties that defines a ${\rm PSL}_2({\mathbb Z})$-cocycle on the space of matrix-valued piecewise analytic functions on the real numbers. We identify the corresponding cocycle with the one coming from the Kashaev invariant of a knot (and its matrix-valued extension) via the refined quantum modularity conjecture of [arXiv:2111.06645] and also relate the matrix-valued invariant with the 3D-index of Dimofte-Gaiotto-Gukov. The cocycle also has an analytic extendability property that leads to the notion of a matrix-valued holomorphic quantum modular form. This is a tale of several independent discoveries, both empirical and theoretical, all illustrated by the three simplest hyperbolic knots.

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  1. On the Virasoro Crossing Kernels at Rational Central Charge

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    At rational central charge, the Virasoro crossing kernels decompose into two admissible square-root-branched kernels; the physical c≤1 kernels are derived for the first time.