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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Searching for modified gravity with baryon oscillations: From SDSS to wide field multiobject spectroscopy (WFMOS)
Physical Review D - Particles, Fields, Gravitation and Cosmology, Volume 74, No. 6, Article 063525, Year 2006
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Description
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. © 2006 The American Physical Society.
Authors & Co-Authors
Yamamoto, Kazuhiro
Japan, Higashihiroshima
Hiroshima University
Bassett, Bruce A.C.C.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
University of Cape Town
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Suto, Yasushi
Japan, Tokyo
The University of Tokyo
Yahata, Kazuhiro
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 19
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1103/PhysRevD.74.063525
ISSN:
15507998
e-ISSN:
15502368
Study Design
Cross Sectional Study