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On amplitudes and field redefinitions

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If you have a question about this talk, please contact Terry Generet .

All QFT Lagrangians are redundant, in the sense that you can locally and invertibly redefine its fields without changing its amplitudes. Much like gauge redundancy in gauge theory, field redefinitions mix physics between different Feynman graphs, and induce large cancellations between graphs, making amplitudes difficult to calculate.

I will describe a compact functional formulation to describe the effects of field redefinitions and show how it can generate new off-shell recursion relations for amplitudes, based on arXiv:2202.06965 and arXiv:2312.06748. I will speculate how an improved understanding of transformations under field redefinitions could help calculate phenomenologically useful amplitudes more efficiently.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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