## 抄録

We study relativistic star solutions in second-order generalized Proca theories characterized by a U(1)-breaking vector field with derivative couplings. In the models with cubic and quartic derivative coupling, the mass and radius of stars become larger than those in general relativity for negative derivative coupling constants. This phenomenon is mostly attributed to the increase of star radius induced by a slower decrease of the matter pressure compared to general relativity. There is a tendency that the relativistic star with a smaller mass is not gravitationally bound for a low central density and hence is dynamically unstable, but that with a larger mass is gravitationally bound. On the other hand, we show that the intrinsic vector-mode couplings give rise to general relativistic solutions with a trivial field profile, so the mass and radius are not modified from those in general relativity.

本文言語 | English |
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論文番号 | 084009 |

ジャーナル | Physical Review D |

巻 | 97 |

号 | 8 |

DOI | |

出版ステータス | Published - 2018 4月 9 |

外部発表 | はい |

## ASJC Scopus subject areas

- 物理学および天文学（その他）