Preprint
Sep 2026
The classical limit of the Magnus expansion
We uncover a connection between the classical limit of the Magnus expansion in quantum field theory and the Malvenuto-Reutenauer Hopf algebra of permutations. We study a cubic scalar theory describing a massive particle coupled to massless scalar quanta, which captures the propagator structure relevant to classical sca...
A. Brandhuber, Graham R. Brown, Sebastien MacDonald et al.
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