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2024

Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis

Pérez-Fernández, A., Medina-Varela, L., Ruggeri, R. et al.

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When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also when defining input parameters for the reconstruction algorithm.

A parameterised template for the model to be fitted is also created based on a (possibly different) fiducial cosmology.
This model reliance can be considered a form of data compression, and the data is then analysed allowing that the true answer is different from the fiducial cosmology assumed.
In this study, we evaluate the impact of the fiducial cosmology assumed in the BAO analysis of the Dark Energy Spectroscopic Instrument (DESI) survey Data Release 1 (DR1) on the final measurements in DESI 2024 III.

Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis · Around

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