Cosmological constant in F(R) supergravity

Understand

A cosmological constant in the regime of low space-time curvature is calculated in the recently proposed version of F(R) supergravity with a generic cubic function F.

• The F(R) supergravity is the N=1 supersymmetric extension of f(R) gravity.
• The cubic model is known to successfully describe a chaotic (slow-roll) inflation in the regime of high space-time curvature.
• We find that a simple extension of the same model allows a positive cosmological constant in the regime of low space-time curvature.