Alcock-Paczynski test with model-independent BAO data

Melia, F.; López-Corredoira, M. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain) [Staff PO]
Bibliographical reference

International Journal of Modern Physics D, Volume 26, Issue 6, id. 1750055-265

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Cosmological tests based on the statistical analysis of galaxy distributions usually depend on source evolution. An exception is the Alcock–Paczyński (AP) test, which is based on the changing ratio of angular to spatial/redshift size of (presumed) spherically-symmetric source distributions with distance. Intrinsic redshift distortions due to gravitational effects may also have an influence, but they can now be overcome with the inclusion of a sharp feature, such as the Baryonic Acoustic Oscillation (BAO) peak. Redshift distortions affect the amplitude of the peak, but impact its position only negligibly. As we shall show here, the use of this diagnostic, with new BAO peaks from SDSS-III/BOSS at average redshifts ⟨z⟩=0.38 〈z〉=0.38 , 0.61 0.61 and 2.34 2.34, disfavors the current concordance (Λ Λ CDM) model at 2.3σ 2.3σ. Within the context of expanding Friedmann–Robertson–Walker (FRW) cosmologies, these data instead favor the zero active mass equation-of-state, ρ+3p=0 ρ+3p=0, where ρ ρ and p p are, respectively, the total density and pressure of the cosmic fluid, the basis for the R h =ct Rh=ct universe.
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