Model-agnostic interpretation of 10 billion years of cosmic evolution traced by BOSS and eBOSS data

We present the first model-agnostic analysis of the complete set of Sloan Digital Sky Survey III (BOSS) and -IV (eBOSS) catalogues of luminous red galaxy and quasar clustering in the redshift range 0. 2 z 2. 2 (10 billion years of cosmic evolution), which consistently includes the baryon acoustic oscillations (BAO), redshift space distortions (RSD) and the shape of the transfer function signatures, from pre- and post-reconstructed catalogues in Fourier space. This approach complements the standard analyses techniques which only focus on the BAO and RSD signatures, and the full-modeling approaches which assume a specific underlying cosmology model to perform the analysis. These model-independent results can then easily be interpreted in the context of the cosmological model of choice. In particular, when combined with z>2. 1 Ly- BAO measurements, the clustering BAO, RSD and Shape parameters can be interpreted within a flat-CDM model yielding h=0. 68160. 0067, ₌=0. 30010. 0057 and 10^9 Aₛ= 2. 430. 20 (or ₈=0. 8580. 036) with a Big Bang Nucleosynthesis prior on the baryon density. Without any external dataset, the BOSS and eBOSS data alone imply ₌=0. 2971 0. 0061 and 10^9 Aₛ=2. 39^+0. 24-₀. ₄₃ (or ₈=0. 8570. 040). For models beyond CDM, eBOSS data alone (in combination with Planck) constrain the sum of neutrino mass to be m_< 0. 40 eV with a BBN prior (m_ <0. 082 eV) at 95\% CL, the curvature energy density to ₖ = -0. 022-₀. ₀₃₈^+0. 032 (ₖ = 0. 0015 0. 0016) and the dark energy equation of state parameter to w=-0. 998-₀. ₀₇₃^+0. 085 (w=-1. 093-₀. ₀₄₄^+0. 048) at 68\% CL without a BBN prior.