Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-11
Phys.Rev. D74 (2006) 063525
Astronomy and Astrophysics
Astrophysics
Physical Review D, in press
Scientific paper
10.1103/PhysRevD.74.063525
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 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.
Bassett Bruce A.
Nichol Robert C.
Suto Yasushi
Yahata Kazuhiro
Yamamoto Kazuhiro
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