Snowmass2021 Cosmic Frontier White Paper: Prospects for obtaining Dark Matter Constraints with DESI

Understand

Despite efforts over several decades, direct-detection experiments have not yet led to the discovery of the dark matter (DM) particle.

• This has led to increasing interest in alternatives to the Lambda CDM (LCDM) paradigm and alternative DM scenarios (including fuzzy DM, warm DM, self-interacting DM, etc.).
• In many of these scenarios, DM particles cannot be detected directly and constraints on their properties can ONLY be arrived at using astrophysical observations.
• The Dark Energy Spectroscopic Instrument (DESI) is currently one of the most powerful instruments for wide-field surveys.