How do hidden symmetries help gravity decouple from particle physics?

String theory on Calabi-Yau manifolds naturally produces approximate symmetries—axionic shift symmetries—each associated with a string-like object. These symmetries act as constraints that determine how gravity weakens relative to other forces and which particle sectors decouple cleanly. The authors map this geometry onto moduli space and show the vector fields encoding these symmetries split into orthogonal groups, with one group fully independent of gravity's effects.