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October 19, 2025Open Access

Supergravity from the Bottom Up

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Using on-shell methods, this analysis reveals how interactions require a spin-2 graviton, suggesting a unique effective theory for supergravity.

Interactions with only spin 0 and spin-1 bosons fail to create a valid effective theory, with a cutoff dependent on particle masses.
Inclusion of a spin-2 graviton leads to four-point amplitudes consistent with known results from N=1 supergravity, enhancing the theory's validity.
The analysis extends interactions to two Majorana spin-3/2 fermions, requiring their unequal masses for achieving unitarity up to the Planck scale.
Results indicate that broken supergravity forms the unique effective theory involving spin-3/2 fermions, independently of mass dependencies.

Gherghetta et al. (2025) studied this question.

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Using on-shell methods, this analysis reveals how interactions require a spin-2 graviton, suggesting a unique effective theory for supergravity.