Modeling the covariance of DESI
power spectrum measurements
Otávio Alves
University of Michigan
Image: KPNO/NOIRLab/NSF/AURA/P. Marenfeld
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.
Image: CTIO/NOIRLab/NSF/AURA/T. Matsopoulos
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
Modeling the covariance of DESI power spectrum measurements Otávio Alves University of Michigan