Cosmology in scalar-vector-tensor theories

Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We study the cosmology on the Friedmann-Lemaître-Robertson-Walker background in scalar-vector-tensor theories with a broken U(1) gauge symmetry. For parity-invariant interactions arising in scalar-vector-tensor theories with second-order equations of motion, we derive conditions for the absence of ghosts and Laplacian instabilities associated with tensor, vector, and scalar perturbations at linear order. This general result is applied to the computation of the primordial tensor power spectrum generated during inflation as well as to the speed of gravity relevant to the late-time cosmic acceleration. We also construct a concrete inflationary model in which a temporal vector component A0 contributes to the dynamics of cosmic acceleration besides a scalar field φ through their kinetic mixings. In this model, we show that all the stability conditions of perturbations can be consistently satisfied during inflation and subsequent reheating.

本文言語English
論文番号024038
ジャーナルPhysical Review D
98
2
DOI
出版ステータスPublished - 2018 7月 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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