### 抄録

We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.

元の言語 | English |
---|---|

記事番号 | 50 |

ジャーナル | Journal of Cosmology and Astroparticle Physics |

巻 | 2012 |

発行部数 | 7 |

DOI | |

出版物ステータス | Published - 2012 7 1 |

外部発表 | Yes |

### Fingerprint

### ASJC Scopus subject areas

- Astronomy and Astrophysics

### これを引用

**Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation.** / Kimura, Rampei; Yamamoto, Kazuhiro.

研究成果: Article

}

TY - JOUR

T1 - Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation

AU - Kimura, Rampei

AU - Yamamoto, Kazuhiro

PY - 2012/7/1

Y1 - 2012/7/1

N2 - We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.

AB - We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.

KW - cosmological perturbation theory

KW - gravitational waves / theory

KW - Modified gravity

UR - http://www.scopus.com/inward/record.url?scp=84864471899&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864471899&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2012/07/050

DO - 10.1088/1475-7516/2012/07/050

M3 - Article

AN - SCOPUS:84864471899

VL - 2012

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 7

M1 - 50

ER -