A translator gets distracted by every rustle in the hall, and a one-hour meeting stretches into two. A single wrong intonation changes the meaning beyond recognition. That's roughly how a particle with spin 3/2—the gravitino — behaves. It cannot exist in isolation: its "speech" must be perfectly coordinated with its surroundings, or the whole structure falls apart.

The author of the paper takes a long-standing argument to its conclusion: a massless gravitino must be part of supergravity — a theory where every particle has a superpartner. This is not a guess but a strict requirement. Otherwise, scattering amplitudes (mathematical descriptions of collisions) cannot be decomposed into consistent parts. And it gets even more demanding: for massive particles in theories with extended supersymmetry, the rules become stricter. For instance, vector bosons (force carriers) must interact according to Lie algebras — the same ones that govern symmetries in particle physics. Gravitational interaction even drags graviphotons, hypothetical partners of the graviton, into the game.

In the final part, the author shows that gravitino scattering in supergravity with unbroken symmetry 𝒩≥4 fully reconstructs the super-Higgs mechanism — the process that gives the gravitino its mass. So the translator doesn't just listen to the hall; they reconstruct the entire scene from the rustles. Theories where such a mechanism is impossible are simply unviable — the gravitino in them "stays silent," and nature rejects them.