Attractor universe in the scalar-tensor theory of gravitation

Kei Ichi Maeda*, Yasunori Fujii

*この研究の対応する著者

研究成果: Article査読

26 被引用数 (Scopus)

抄録

In the scalar-tensor theory of gravitation it seems nontrivial to establish if solutions of the cosmological equations in the presence of a cosmological constant (or a vacuum energy) behave as attractors independently of the initial values. We develop a general formulation in terms of two-dimensional phase space, mainly according to the Brans-Dicke model requiring the scalar field decoupled from the matter Lagrangian in the Jordan frame. We show that there are two kinds of fixed points, one of which is an attractor depending on the coupling constant and equation of state. We find that the static universe in the Jordan frame is an attractor in the presence of a cosmological constant for some range of the coupling constant. We extend our analysis to a power-law potential, finding a new type of power-law inflation caused by the coupling to the matter fluid, also as an attractor.

本文言語English
論文番号084026
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
79
8
DOI
出版ステータスPublished - 2009 4月 1

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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