Cosmological constant in F(R) supergravity
arXiv:1109.3245 · doi:10.1016/j.physletb.2011.10.048
Abstract
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.
10 pages, LaTeX, no figures; Introduction and Conclusion expanded, references added
References in corpus (11)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
- Disappearing cosmological constant in f(R) gravity
- Embedding (R+R^2)-Inflation into Supergravity
- Inflation and non-minimal scalar-curvature coupling in gravity and supergravity
- Superstring-inspired supergravity as the universal source of inflation and quintessence
- Seeking the Loop Quantum Gravity Barbero-Immirzi Parameter and Field in 4D, = 1 Supergravity
- Slow-roll inflation in (R+R*4) gravity
- Chaotic inflation in F(R) supergravity
- Scalar potential in F(R) supergravity
- Cosmological properties of a generic (\cal R)^2-supergravity
Cited by in corpus (6)
- Inflation and non-minimal scalar-curvature coupling in gravity and supergravity
- Modified Supergravity and Early Universe: the Meeting Point of Cosmology and High-Energy Physics
- Old-minimal supergravity models of inflation
- On the supersymmetrization of inflation in f(R) gravity
- New Actions for Modified Gravity and Supergravity
- Dark Energy in Modified Supergravity