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We expand the swampland to include theories inconsistent with quantum supergravity. The new "gravitino swampland conjecture" states that the gravitino sound speed must be nonvanishing in these theories.

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Area of Science:

  • Theoretical Physics
  • Quantum Gravity
  • String Theory

Background:

  • The swampland comprises effective field theories (EFTs) inconsistent with quantum gravity.
  • Quantum supergravity introduces additional constraints on EFTs.

Purpose of the Study:

  • To extend the definition of the swampland to include EFTs inconsistent with quantum supergravity.
  • To propose the "gravitino swampland conjecture".

Main Methods:

  • Analyzing EFTs that become inconsistent upon quantization of the gravitino.
  • Formulating a conjecture based on these analyses.

Main Results:

  • The swampland is enlarged to encompass EFTs inconsistent with quantum supergravity.
  • The "gravitino swampland conjecture" is proposed: gravitino sound speed must be nonvanishing in EFTs that are low-energy limits of quantum supergravity.

Conclusions:

  • The conjecture has significant implications for theoretical physics and observational cosmology.
  • The conjecture is supported by established string theory scenarios like KKLT and large volume scenarios for moduli stabilization.