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BCJ, worldsheet quantum algebra and KZ equations

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arxiv 2005.05177 v2 pith:FJQBDOYK submitted 2020-05-11 hep-th hep-phmath.QA

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keywords quantumalgebragroupnumeratorstringappearsassociatedcasimir
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We exploit the correspondence between twisted homology and quantum group to construct an algebra explanation of the open string kinematic numerator. In this setting the representation depends on string modes, and therefore the cohomology content of the numerator, as well as the location of the punctures. We show that quantum group root system thus identified helps determine the Casimir appears in the Knizhnik-Zamolodchikov connection, which can be used to relate representations associated with different puncture locations.

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  1. HEFT Numerators from Kinematic Algebra

    hep-th 2025-01 conditional novelty 6.0 of 10

    The heavy-mass effective field theory kinematic numerators are derived as the field theory limit of nested commutators of string vertex operators, reproducing and extending earlier fusion-rule results.

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