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ID 19252
本文ファイル
著者
Bassett, Bruce A.
Nichol, Robert C.
Suto, Yasushi
Yahata, Kazuhiro
抄録(英)
We discuss how the baryon acoustic oscillation (BAO) signatures in the galaxy power spectrum can distinguish between modified gravity and the cosmological constant as the source of cosmic acceleration. To this end we consider a model characterized by a parameter n, which corresponds to the Dvali- Gabadadze-Porrati (DGP) model if n = 2 and reduces to the standard spatially flat cosmological constant concordance model for n equal to infinity. We find that the different expansion histories of the modified gravity models systematically shifts the peak positions of BAO. A preliminary analysis using the current SDSS luminous red galaxy (LRG) sample indicates that the original DGP model is disfavored unless the matter density parameter exceeds 0.3. The constraints will be strongly tightened with future spectroscopic samples of galaxies at high redshifts. We demonstrate that WFMOS, in collaboration with other surveys such as Planck, will powerfully constrain modified gravity alternatives to dark energy as the explanation of cosmic acceleration.
掲載誌名
Physical Review D - Particles, Fields, Gravitation and Cosmology
74巻
6号
開始ページ
063525-1
終了ページ
063525-11
出版年月日
2006-09-27
出版者
American Physical Society
ISSN
1550-7998
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
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publisher
権利情報
Copyright (c) 2006 The American Physical Society.
関連情報URL
部局名
理学研究科