Combined full shape analysis of BOSS galaxies and eBOSS quasars using an iterative emulator

• DOI: 10.1093/mnras/stac2114
• Publication Date: 2022-07-29T02:10:29Z
• Authors: Richard Neveux; Etienne Burtin; Vanina Ruhlmann-K...; Arnaud de Mattia; Agne Semenaite; Kyle S Dawson; Axel de la Macorra; Will J Percival; Graziano Rossi; Donald P Schneider; Gong-Bo Zhao
• Keywords: Boss; Redshift-space distortions

ABSTRACT Standard full-shape clustering analyses in Fourier space rely on a fixed power spectrum template, defined at the fiducial cosmology used to convert redshifts into distances, and compress cosmological information Alcock–Paczynski parameters linear growth rate of structure. In this paper, we propose an analysis method that operates directly parameter varies template accordingly each tested point. Predictions for multipoles from TNS model are computed different cosmologies framework $\Lambda \rm {CDM}$. Applied final eBOSS QSO LRG samples together with low-z DR12 BOSS galaxy sample, our results set constraints Ωcdm, H0, σ8, Ωb, ns. To reduce number models, construct iterative process sample likelihood surface, where iteration consists Gaussian regression. This is validated mocks N-body simulations. From combined (e)BOSS data, obtain following constraints: σ8 = 0.877 ± 0.049 $\Omega _{\rm m}=0.304^{+0.016}_{-0.010}$ without any external prior. The quasar alone shows 3.1σ discrepancy compared Planck prediction.