Goldstino condensation?

It was argued in [1] that the Volkov-Akulov (VA) model as well as similar models in supergravity and the related KKLT model in string theory, suffer from tachyonic instabilities due to goldstino condensation. The authors of [1] constructed a specific model with two unconstrained interacting chiral superfields with linearly realized supersymmetry which has an unstable vacuum. They claimed that this model becomes equivalent to the VA model in the UV limit. We show that the UV limit of their model is discontinuous, and the vacuum instability of the model proposed in [1] is not relevant to the VA model, to related models in supergravity, and to the KKLT construction.

Automated summary

This article discusses the tachyonic instabilities caused by goldstino condensation in the Volkov-Akulov (VA) model, related supergravity models, and the KKLT model in string theory. The authors of [1] constructed a specific model with two unconstrained interacting chiral superfields that have linearly realized supersymmetry and an unstable vacuum state. However, it is shown that the UV limit of their model is discontinuous and the vacuum instability proposed in [1] is not relevant to the VA model, related supergravity models, and the KKLT construction.