Cosmological constraints from the power spectrum of eBOSS quasars

Abstract

We present the effective-field theory (EFT)-based cosmological full-shape analysis of the anisotropic power spectrum of eBOSS quasars at the effective redshift $z_{\mathrm{eff}}=1.48$. We perform extensive tests of our pipeline on simulations, paying a particular attention to the modeling of observational systematics, such as redshift smearing, fiber collisions, and the radial integral constraint. Assuming the minimal $\Lambda$CDM model, and fixing the primordial power spectrum tilt and the physical baryon density, we find the Hubble constant $H_0=(66.7\pm 3.2)$km~s${}^{-1}$Mpc${}^{-1}$, the matter density fraction ${\Omega }_m=0.32\pm 0.03$, and the late-time mass fluctuation amplitude ${\sigma }_8=0.95\pm 0.08$. These measurements are fully consistent with the Planck cosmic microwave background results. Our eBOSS quasar $S_8$ posterior, $0.98\pm 0.11$, does not exhibit the so-called $S_8$ tension. Our work paves the way for systematic full-shape analyses of quasar samples from future surveys like DESI.

19+2 pages, 13 figures, 6+2 tables; v2: Appendix F added, matched version accepted by Phys. Rev. D

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• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• Self-Interacting Neutrinos in Light of Large-Scale Structure Data
• Observational constraints on early dark energy
• $S_8$ Tension in the Context of Dark Matter-Baryon Scattering
• A Parameter-Masked Mock Data Challenge for Beyond-Two-Point Galaxy Clustering Statistics
• Cosmological constraints on early dark energy from the full shape analysis of eBOSS DR16
• A multitracer analysis for the eBOSS galaxy sample based on the effective field theory of large-scale structure
• The ACCEL2 Project: Precision Measurements of EFT Parameters and BAO Peak Shifts for the Lyman-$\alpha$ Forest
• Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography
• Bounds on Velocity-Dependent Dark Matter-Baryon Scattering from Large-Scale Structure
• Reducing nuisance prior sensitivity via non-linear reparameterization, with application to EFT analyses of large-scale structure
• Bispectrum constraints on Primordial non-Gaussianities with the eBOSS DR16 quasars
• Cosmological perturbation theory for large scale structure in phase space
• A semi-analytic estimate for the effective sound speed counterterm in the EFTofLSS