Model-independent test of the FLRW metric, the flatness of the Universe, and non-local estimation of H0 rd
Using measurements of H(z) and dA(z) from the Baryon Oscillation Spectroscopic Survey (BOSS) DR12 and luminosity distances from the Joint Lightcurve Analysis (JLA) compilation of supernovae (SN), we measure H0rd without any model assumption. Our measurement of H0 rd = (10033.20+333.10-371.81 (SN) ± 128.19 (BAO)) km s-1 is consistent with Planck constrains for the flat ΛCDM model. We also report that higher expansion history rates h(z) (among the possibilities) as well as lower-bound values of H0rd result in better internal consistency among the independent data (H(z)rd and dA(z)/rd from BAO at z=0.32 and z=0.57 and dL from JLA) we used in this work. This can be interpreted as an interesting and independent support of Planck cosmology without using any cosmic microwave background data. We then combine these observables to test the Friedmann-Lemaȋtre-Robertson-Walker (FLRW) metric and the flatness of the Universe in a model-independent way at two redshifts, namely 0.32 and 0.57, by introducing a new diagnostic for flat-FLRW, Θ(z), which only depends on observables of BAO and SN data. Our results are consistent with a flat-FLRW Universe within 2σ.
Journal of Cosmology and Astroparticle Physics
- Pub Date:
- January 2017
- Astrophysics - Cosmology and Nongalactic Astrophysics
- Matches the published version in JCAP. Fig. 3 was improved