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- W4309264849 abstract "ABSTRACT When performing cosmological inference, standard analyses of the Lyman α (Ly α) three-dimensional correlation functions only consider the information carried by the distinct peak produced by baryon acoustic oscillations (BAO). In this work, we address whether this compression is sufficient to capture all the relevant cosmological information carried by these functions. We do this by performing a direct fit to the full shape, including all physical scales without compression, of synthetic Ly α autocorrelation functions and cross-correlations with quasars at effective redshift zeff = 2.3, assuming a DESI-like survey, and providing a comparison to the classic method applied to the same data set. Our approach leads to a $3.5{{ rm per cent}}$ constraint on the matter density ΩM, which is about three to four times better than what BAO alone can probe. The growth term fσ8(zeff) is constrained to the $10{{ rm per cent}}$ level, and the spectral index ns to $sim 3-4{{ rm per cent}}$. We demonstrate that the extra information resulting from our ‘direct fit’ approach, except for the ns constraint, can be traced back to the Alcock–Paczynski effect and redshift space distortion information." @default.
- W4309264849 created "2022-11-25" @default.
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- W4309264849 date "2022-11-15" @default.
- W4309264849 modified "2023-10-15" @default.
- W4309264849 title "Direct cosmological inference from three-dimensional correlations of the Lyman α forest" @default.
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- W4309264849 doi "https://doi.org/10.1093/mnras/stac3257" @default.
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