Gravitino Swampland Conjecture

We extend the swampland from effective field theories (EFTs) inconsistent with quantum gravity to EFTs inconsistent with quantum supergravity. This enlarges the swampland to include EFTs that become inconsistent when the gravitino is quantized. We propose the gravitino swampland conjecture: the gravitino sound speed must be nonvanishing in all EFTs that are low-energy limits of quantum supergravity. This seemingly simple statement has important consequences for both theories and observations. The conjecture is consistent with and supported by the Kachru-Kallosh-Linde-Trivedi and large volume scenarios for moduli stabilization in string theory.

Automated summary

The gravitino swampland conjecture expands the scope of effective field theories, proposing that the gravitino sound speed must be nonvanishing. This conjecture has important implications for both theories and observations, and is supported by scenarios for moduli stabilization in string theory.