### Abstract

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.

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

Article number | 50 |

Journal | Journal of Cosmology and Astroparticle Physics |

Volume | 2012 |

Issue number | 7 |

DOIs | |

Publication status | Published - 2012 Jul 1 |

Externally published | Yes |

### Fingerprint

### Keywords

- cosmological perturbation theory
- gravitational waves / theory
- Modified gravity

### ASJC Scopus subject areas

- Astronomy and Astrophysics

### Cite this

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

Research output: Contribution to journal › Article

*Journal of Cosmology and Astroparticle Physics*, vol. 2012, no. 7, 50. https://doi.org/10.1088/1475-7516/2012/07/050

}

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 -