Cosmological constant in F(R) supergravity

Details Cosmological constant in F(R) supergravity Cosmological constant in F(R) supergravity

2011-09-15

arxiv.org/abs/1109.3245v3

Physics Letters B 705 (2011) 410-413

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, LaTeX, no figures; Introduction and Conclusion expanded, references added

Scientific paper

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. The inflaton superfield in F(R) supergravity (like inflaton in f(R) gravity) violates the Strong Energy Condition and thus breaks the restriction of the standard supergravity (with usual matter) that can only have either a negative or vanishing cosmological constant.

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