### 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 |
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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 |

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### Keywords

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

### ASJC Scopus subject areas

- Astronomy and Astrophysics