Assisted dark energy

Junko Ohashi, Shinji Tsujikawa

研究成果: Paper査読

抄録

We study cosmological dynamics of a multi-field system for a general Lagrangian density having scaling solutions. This allows the possibility that scaling radiation and matter eras are followed by a late-time cosmic acceleration through an assisted inflation mechanism. Using the bound coming from Big-Bang-Nucleosynthesis (BBN) and the condition under which each field cannot drive inflation as a single component of the universe, we find the following features: (i) a transient or eternal cosmic acceleration can be realized after the scaling matter era, (ii) a "thawing" property of assisting scalar fields is crucial to determine the evolution of the field equation of state wφ, and (iii) the field equation of state today can be consistent with the observational bound wφin the presence of multiple scalar fields.

本文言語English
ページ279-282
ページ数4
出版ステータスPublished - 2009
外部発表はい
イベント19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan
継続期間: 2009 11 302009 12 4

Conference

Conference19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
国/地域Japan
CityTokyo
Period09/11/3009/12/4

ASJC Scopus subject areas

  • 原子分子物理学および光学

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