HOD-Dependent Systematics in Emission Line Galaxies for the DESI 2024 BAO analysis

Understand

The Dark Energy Spectroscopic Instrument (DESI) will provide precise measurements of Baryon Acoustic Oscillations (BAO) to constrain the expansion history of the Universe and set stringent constraints on dark energy.

• Therefore, precise control of the global error budget due to various systematic effects is required for the DESI 2024 BAO analysis.
• In this work, we focus on the robustness of the BAO analysis against the Halo Occupation Distribution (HOD) modeling for the Emission Line Galaxy (ELG) tracer.
• Based on a common dark matter simulation, our analysis relies on HOD mocks tuned to early DESI data, namely the One-Percent survey data.