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Infinite sets of asymptotic soft-charges were recently shown to be related tonew symmetries of the $S$-matrix, spurring a large amount of research on thisand related questions. Notwithstanding, the raison-d'\^etre of thesesoft-charges rests on less firm ground, insofar as their known derivationsthrough generalized Noether procedures tend to rely on the fixing of(gauge-breaking) boundary conditions rather than on manifestly gauge-invariantcomputations. In this article, we show that a geometrical framework anchored inthe space of field configurations singles out the known leading-order softcharges in gauge theories. Our framework unifies the treatment of finite andinfinite regions, and thus it explains why the infinite enhancement of thesymmetry group is a property of asymptotic null infinity and should not beexpected to hold within finite regions, where at most a finite number ofphysical charges -- corresponding to the reducibility parameters of thequasi-local field configuration -- is singled out. As a bonus, our formalismalso suggests a simple proposal for the origin of magnetic-type charges atasymptotic infinity based on spacetime (Lorentz) covariance rather thanelectromagnetic duality.

Soft charges from the geometry of field space