Abstract
We study the effect of electromagnetic interactions on the classical soft theorems on an asymptotically AdS background in 4 spacetime dimensions, in the limit of a small cosmological constant or equivalently a large AdS radius l. This identifies 1/l2 perturbative corrections to the known asymptotically flat spacetime leading and subleading soft factors. Our analysis is only valid to leading order in 1/l2. The leading soft factor can be expected to be universal and holds beyond tree level. This allows us to derive a 1/l2 corrected Ward identity, following the known equivalence between large gauge Ward identities and soft theorems in asymptotically flat spacetimes.
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Banerjee, N., Fernandes, K. & Mitra, A. Soft photon theorem in the small negative cosmological constant limit. J. High Energ. Phys. 2021, 105 (2021). https://doi.org/10.1007/JHEP08(2021)105
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DOI: https://doi.org/10.1007/JHEP08(2021)105