Pure de Sitter Supergravity

TL;DR

This paper constructs an explicit supergravity model with spontaneously broken supersymmetry that admits de Sitter space solutions, connecting superconformal methods with known goldstino theories.

Contribution

It provides a complete locally supersymmetric de Sitter supergravity action involving only the graviton and fermions, derived via superconformal techniques.

Findings

Reproduces Volkov-Akulov theory in the global limit

Achieves a de Sitter solution with all fermions vanishing

Constructs a pure supergravity with positive cosmological constant

Abstract

Using superconformal methods we derive an explicit de Sitter supergravity action invariant under spontaneously broken local ${\cal N}=1$ supersymmetry. The supergravity multiplet interacts with a nilpotent goldstino multiplet. We present a complete locally supersymmetric action including the graviton and the fermionic fields, gravitino and goldstino, no scalars. In the global limit when supergravity multiplet decouples, our action reproduces the Volkov-Akulov theory. In the unitary gauge where goldstino vanishes we recover pure supergravity with the positive cosmological constant. The classical equations of motion, with all fermions vanishing, have a maximally symmetric solution: de Sitter space.