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• W4366142863 abstract "We present a framework for self-consistent cosmological analyses of the full-shape anisotropic bispectrum, including the quadrupole $(ell=2)$ and hexadecapole $(ell=4)$ moments. This features a novel window-free algorithm for extracting the latter quantities from data, derived using a maximum-likelihood prescription. Furthermore, we introduce a theoretical model for the bispectrum multipoles (which does not introduce new free parameters), and test both aspects of the pipeline on several high-fidelity mocks, including the PT Challenge suite of gigantic cumulative volume. This establishes that the systematic error is significantly below the statistical threshold, both for the measurement and modeling. As a realistic example, we extract the large-scale bispectrum multipoles from BOSS DR12 and analyze them in combination with the power spectrum data. Assuming a minimal $Lambda$CDM model, with a BBN prior on the baryon density and a textit{Planck} prior on $n_s$, we can extract the remaining cosmological parameters directly from the clustering data. The inclusion of the unwindowed higher-order $(ell>0)$ large-scale bispectrum multipoles is found to moderately improve one-dimensional cosmological parameter posteriors (at the $5%-10%$ level), though these multipoles are detected only in three out of four BOSS data segments at $approx 5sigma$. Combining information from the power spectrum and bispectrum multipoles, the real space power spectrum, and the post-reconstructed BAO data, we find $H_0 = 68.2pm 0.8~mathrm{km},mathrm{s}^{-1}mathrm{Mpc}^{-1}$, $Omega_m =0.33pm 0.01$ and $sigma_8 = 0.736pm 0.033$ (the tightest yet found in perturbative full-shape analyses). Our estimate of the growth parameter $S_8=0.77pm 0.04$ agrees with both weak lensing and CMB results." @default.
• W4366142863 created "2023-04-19" @default.
• W4366142863 creator A5044710856 @default.
• W4366142863 creator A5052222468 @default.
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• W4366142863 creator A5089500886 @default.
• W4366142863 date "2023-04-17" @default.
• W4366142863 modified "2023-10-15" @default.
• W4366142863 title "Cosmology with the galaxy bispectrum multipoles: Optimal estimation and application to BOSS data" @default.
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