Cosmological scaling solutions for multiple scalar fields

Takeshi Chiba, Antonio De Felice*, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

12 被引用数 (Scopus)

抄録

The general k-essence Lagrangian for the existence of cosmological scaling solutions is derived in the presence of multiple scalar fields coupled to a barotropic perfect fluid. In addition to the scaling fixed point associated with the dynamics during the radiation and matter eras, we also obtain a scalar-field dominated solution relevant to dark energy and discuss the stability of them in the two-field setup. We apply our general results to a model of two canonical fields with coupled exponential potentials arising in string theory. Depending on model parameters and initial conditions, we show that the scaling matter-dominated epochs followed by an attractor with cosmic acceleration can be realized with/without the couplings to scalar fields. The different types of scaling solutions can be distinguished from each other by the evolution of the dark energy equation of state from high redshifts to today.

本文言語English
論文番号023516
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
90
2
DOI
出版ステータスPublished - 2014 7 10
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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