Abstract
We discuss constraints imposed by soft limits for effective field theories arising from symmetry breaking. In particular, we consider those associated with anomalous conformal symmetry as well as duality symmetries in supergravity. We verify these soft theorems for the dilaton effective action relevant for the a-theorem, as well as the one-loop effective action for \( \mathcal{N}=4 \) supergravity. Using the universality of leading transcendental coefficients in the α′ expansion of string theory amplitudes, we study the matrix elements of operator R 4 with half maximal supersymmetry. We construct the non-linear completion of R 4 that satisfies both single and double soft theorems up to seven points. This supports the existence of duality invariant completion of R 4.
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Huang, Yt., Wen, C. Soft theorems from anomalous symmetries. J. High Energ. Phys. 2015, 1–31 (2015). https://doi.org/10.1007/JHEP12(2015)143
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DOI: https://doi.org/10.1007/JHEP12(2015)143