Power-laws f(R) theories are cosmologically unacceptable

Luca Amendola*, David Polarski, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

79 被引用数 (Scopus)

抄録

In a recent paper,1 we have shown that f(R) = R + μR n modified gravity dark energy models are not cosmologically viable because during the matter era that precedes the accelerated stage the cosmic expansion is given by a ∼ t1/2 rather than a ∼ t 2/3, where a is a scale factor and t is the cosmic time. A recent work by Capozziello et al.2 criticized our results presenting some apparent counter-examples to our claim in f(R) = μRn models. We show here that those particular Rn models can produce an expansion as a ∼ t2/3 but this does not connect to a late-time acceleration. Hence, though acceptable f(R) dark energy models might exist, the Rn models presented in Capozziello et al. are not cosmologically viable, confirming our previous results in Ref. 1.

本文言語English
ページ(範囲)1555-1561
ページ数7
ジャーナルInternational Journal of Modern Physics D
16
10
DOI
出版ステータスPublished - 2007 10月
外部発表はい

ASJC Scopus subject areas

  • 数理物理学
  • 天文学と天体物理学
  • 宇宙惑星科学

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