Scanning of the Supersymmetry Breaking Scale and the Gravitino Mass in Supergravity

Understand

We consider the minimal three-form ${\cal N}=1$ supergravity coupled to nilpotent three-form chiral superfields.

• The supersymmetry breaking is sourced by the three-forms of the chiral multiplets, while the value of the gravitino mass is controlled by the three-form of the supergravity multiplet.
• The three-forms can nucleate membranes which scan both the supersymmetry breaking scale and the gravitino mass.
• The peculiar supergravity feature that the cosmological constant is the sum of a positive contribution from the supersymmetry breaking scale and a negative contribution from the gravitino mass makes the cosmological constant jump.