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gr-qc2026
Classical soft theorems meet the post-Newtonian expansion
Samim Akhtar, Riccardo Sturani
Classical soft theorems govern the non-analytic structure of electromagnetic and gravitational radiation in the low-frequency regime, with the gravitational memory effect providing…
gr-qc2026
On scalar and electromagnetic perturbations of the root--Kerr object
Samim Akhtar
We study scalar and electromagnetic perturbations of the root--Kerr object. Its source-free exterior carries the electromagnetic field obtained in the vanishing-mass limit of the K…