### 抜粋

We study constraints on f(R) dark energy models from solar system experiments combined with experiments on the violation of the equivalence principle. When the mass of an equivalent scalar field degree of freedom is heavy in a region with high density, a spherically symmetric body has a thin shell so that an effective coupling of the fifth force is suppressed through a chameleon mechanism. We place experimental bounds on the cosmologically viable models recently proposed in the literature that have an asymptotic form f(R)=R-λRc[1-(Rc/R)2n] in the regime R Rc. From the solar system constraints on the post-Newtonian parameter γ, we derive the bound n>0.5, whereas the constraints from the violations of the weak and strong equivalence principles give the bound n>0.9. This allows a possibility to find the deviation from the Λ-cold dark matter (ΛCDM) cosmological model. For the model f(R)=R-λRc(R/Rc)p with 0<p<1 the severest constraint is found to be p<10-10, which shows that this model is hardly distinguishable from the ΛCDM cosmology.

元の言語 | English |
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記事番号 | 107501 |

ジャーナル | Physical Review D - Particles, Fields, Gravitation and Cosmology |

巻 | 77 |

発行部数 | 10 |

DOI | |

出版物ステータス | Published - 2008 5 8 |

外部発表 | Yes |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)