### 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.

Original language | English |
---|---|

Pages (from-to) | 410-413 |

Number of pages | 4 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 705 |

Issue number | 4 |

DOIs | |

Publication status | Published - 17 Nov 2011 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*705*(4), 410-413. https://doi.org/10.1016/j.physletb.2011.10.048

**Cosmological constant in F(R) supergravity.** / Ketov, Sergei V.; Watanabe, Natsuki.

Research output: Contribution to journal › Article

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 705, no. 4, pp. 410-413. https://doi.org/10.1016/j.physletb.2011.10.048

}

TY - JOUR

T1 - Cosmological constant in F(R) supergravity

AU - Ketov, Sergei V.

AU - Watanabe, Natsuki

PY - 2011/11/17

Y1 - 2011/11/17

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=82555169513&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=82555169513&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2011.10.048

DO - 10.1016/j.physletb.2011.10.048

M3 - Article

AN - SCOPUS:82555169513

VL - 705

SP - 410

EP - 413

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 4

ER -