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- W4313434058 abstract "It was recently proposed that the kinematic algebra featuring in the colour-kinematics duality for scattering amplitudes in heavy-mass effective field theory (HEFT) and Yang-Mills theory is a quasi-shuffle Hopf algebra. The associated fusion product determines the structure of the Bern-Carrasco-Johansson (BCJ) numerators, which are manifestly gauge invariant and with poles corresponding to heavy-particle exchange. In this work we explore the deep connections between the quasi-shuffle algebra and general physical properties of the scattering amplitudes. First, after proving the double-copy form for gravitational HEFT amplitudes, we show that the coproducts of the kinematic algebra are in correspondence with factorisations of BCJ numerators on massive poles. We then study an extension of the standard quasi-shuffle Hopf algebra to a non-abelian version describing BCJ numerators with all possible gluon orderings. This is achieved by tensoring the original algebra with a particular Hopf algebra of orderings. In this extended version, a specific choice of the coproduct in the algebra of orderings leads to an antipode in the resulting Hopf algebra that has the interpretation of reversing the gluons' order within each BCJ numerator." @default.
- W4313434058 created "2023-01-06" @default.
- W4313434058 creator A5017176162 @default.
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- W4313434058 date "2022-12-19" @default.
- W4313434058 modified "2023-10-04" @default.
- W4313434058 title "Amplitudes, Hopf algebras and the colour-kinematics duality" @default.
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- W4313434058 doi "https://doi.org/10.1007/jhep12(2022)101" @default.
- W4313434058 hasPublicationYear "2022" @default.
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