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.

arXiv comment19+2 pages, 13 figures, 6+2 tables; v2: Appendix F added, matched version accepted by Phys. Rev. D

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