Alcock-Paczynski Test with Model-independent BAO Data

TL;DR

This paper employs a model-independent BAO-based Alcock-Paczynski test using SDSS-III/BOSS data to challenge the standard LCDM cosmology, favoring a zero active mass universe instead.

Contribution

It introduces a BAO-based AP test that minimizes source evolution effects, providing new constraints on cosmological models using high-redshift data.

Findings

Disfavors LCDM at 2.3 sigma significance.

Supports zero active mass equation-of-state (rho+3p=0).

Favors R_h=ct universe over standard cosmology.

Abstract

Cosmological tests based on the statistical analysis of galaxy distributions usually depend on source evolution. An exception is the Alcock-Paczynski (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, 0.61 and 2.34, disfavors the current concordance (LCDM) model at 2.3 sigma. Within the context of expanding Friedmann-Robertson-Walker (FRW) cosmologies, these data instead favor the zero active mass equation-of-state, rho+3p=0, where rho and p are, respectively, the total density and pressure of the cosmic fluid, the basis for the R_h=ct universe.