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Probing the limits of cosmological information from the Lyman-of forest 2-point correlation functions
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DOI：10.1088/1475-7516/2026/05/010.png)
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Abstract
En 中文
The standard cosmological analysis with the Lycx forest relies on a continuum fitting procedure that suppresses information on large scales and distorts the three-dimensional correlation function on all scales. In this work, we present the first cosmological forecasts without continuum fitting distortion in the Lycx forest, focusing on the recovery of large-scale information. Using idealized synthetic data, we compare the constraining power of the full shape of the Lycx forest auto-correlation and its cross-correlation with quasars using the baseline continuum fitting analysis versus the true continuum. We find that knowledge of the true continuum enables a similar to 10% reduction in uncertainties on the Alcock-Paczy & nacute;ski (AP) parameter and the matter density, ohm m. We also explore the impact of large-scale information by extending the analysis up to separations of 240 h-1Mpc along and across the line of sight. The combination of these analysis choices can recover significant large-scale information, yielding up to a similar to 15% improvement in AP constraints. This improvement is analogous to extending the Lycx forest survey area by similar to 40%.
Keywords:
cosmological parameters from LSS
Lyman alpha forest
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