Modeling the covariance of DESI
power spectrum measurements

Otávio Alves

University of Michigan

DESI DR1 covariance task

Co-leads: Otávio Alves, Misha Rashkovetskyi, Daniel Forero-Sánchez

theoretical covariances of power spectrum multipoles

• Based on Wadekar & Scoccimarro 2019.
• Trispectrum at tree-level using Kobayashi 2023.

Dark Energy Survey Year 3 Results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

Co-leads: Agnès Ferté, Jessie Muir

Dark Energy Survey Year 6 Extensions

Co-leads: Otávio Alves, Sujeong Lee, Marco Raveri

Weyl potential

\[ \Phi = \frac{\psi + \phi}{2}, \qquad {\rm d}s^2=a(\tau)^2[−(1+2\psi){\rm d}\tau^2+(1−2\phi){\rm d}x^2] \]

• Deviations from General Relativity
• Anisotropic stress

DES Y6: Constraints on Dark Matter properties and Dark Energy

Summary

• Analytical covariances of \(P_\ell(k)\) with DESI DR1-like realism. 🤯
  • Methodology paper in prep. 👀
  • Code available at cosmodesi/thecov 🆒 🆕 💯
• DES legacy results on physics beyond ΛCDM upcoming 😍
  • With an extended analysis of the physics of the dark sector 😮

Slides at: otavioalves.com