Enhancing DESI DR1 Full-Shape analyses using HOD-informed priors

2025/04/14 by Zhang, Hanyu, Bonici, Marco, Rocher, Antoine +57 · 13 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2504.10407

Abstract

We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging physical insights from the galaxy-halo connection, these HOD-informed priors on nuisance parameters substantially mitigate projection effects in extended cosmological models that allow for dynamical dark energy. The resulting credible intervals now encompass the posterior maximum from the baseline analysis using gaussian priors, eliminating a significant posterior shift observed in baseline studies. In the ΛCDM framework, a combined DESI DR1 FS information and constraints from the DESI DR1 baryon acoustic oscillations (BAO)-including Big Bang Nucleosynthesis (BBN) constraints and a weak prior on the scalar spectral index-yields Ω_{\rm m} = 0.2994± 0.0090 and σ₈ = 0.836^+0.024_-0.027, representing improvements of approximately 4% and 23% over the baseline analysis, respectively. For the w₀w_aCDM model, our results from various data combinations are highly consistent, with all configurations converging to a region with w₀ > -1 and w_a < 0. This convergence not only suggests intriguing hints of dynamical dark energy but also underscores the robustness of our HOD-informed prior approach in delivering reliable cosmological constraints.

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Cited by

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• The simple way to measure evolving dark energy without prior-volume effects
• Effort.jl: a fast and differentiable emulator for the Effective Field Theory of the Large Scale Structure of the Universe
• Frequentist Cosmological Constraints from Full-Shape Clustering Measurements in DESI DR1
• Testing signatures of phantom crossing through full-shape galaxy clustering analysis
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Related

• Reanalyzing DESI DR1: 5. Cosmological Constraints with Simulation-Based Priors
• Exploring HOD-dependent systematics for the DESI 2024 Full-Shape galaxy clustering analysis
• Reanalyzing DESI DR1: 1. ΛCDM Constraints from the Power Spectrum and Bispectrum
• DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements
• Frequentist Cosmological Constraints from Full-Shape Clustering Measurements in DESI DR1