Can inhomogeneities accelerate the cosmic volume expansion?

Tomohiro Kai, Hiroshi Kozaki, Ken Ichi Nakao, Yasusada Nambu, Chul Moon Yoo

研究成果: ジャーナルへの寄稿学術誌査読

75 被引用数 (Scopus)

抄録

If expanding and contracting regions coexist in the universe, the speed of the cosmic volume expansion can be accelerated. We construct simple inhomogeneous dust-filled universe models in which the speed of the cosmic volume expansion is accelerated for finite periods. These models are constructed by removing spherical domains from the Einstein-de Sitter universe and filling each domain with a Lemaître-Tolman-Bondi dust sphere possessing the same gravitational mass as the removed region. This represents an exact solution of the Einstein equations. We find that acceleration of the cosmic volume expansion is realized in some cases when the size of the contracting region is comparable to the horizon radius of the Einstein-de Sitter universe though this model is very different from the universe observed today. This result implies that non-linear general relativistic effects of inhomogeneities are very important to realize the acceleration of the cosmic volume expansion.

本文言語英語
ページ(範囲)229-240
ページ数12
ジャーナルProgress of Theoretical Physics
117
2
DOI
出版ステータス出版済み - 2月 2007
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)

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