PIRSA:25070023 Conference Cosmology

DOI10.48660/25070023

Conference/School: Cosmic Ecosystems

Ferraro, S. (2025). A CMB view of DESI galaxies. Perimeter Institute. https://pirsa.org/25070023

Ferraro, Simone. A CMB view of DESI galaxies. Perimeter Institute, Jul. 29, 2025, https://pirsa.org/25070023 

@misc{ pirsa_PIRSA:25070023,
  doi = {10.48660/25070023},
  url = {https://pirsa.org/25070023},
  author = {Ferraro, Simone},
  keywords = {Cosmology},
  language = {en},
  title = {A CMB view of DESI galaxies},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {jul},
  note = {PIRSA:25070023 see, \url{https://pirsa.org}}
}

Abstract

Information about the late-time Universe is imprinted on the small-scale CMB as photons travel to us from the surface of last scattering. Several processes are at play and small-scale fluctuations are very rich and non-Gaussian in nature. I will review some recent and exciting results that use the Sunyaev-Zel'dovich (SZ) effects and gravitational lensing to paint a full picture of the visible and dark matter in and around DESI galaxies. I will discuss how a combination of measurements can probe velocity fields at cosmological distances and inform us on galaxy energetics. I will also show recent measurements of weak lensing of the CMB and its cross-correlation with DESI, and how they can help us interpret intriguing discrepancies in cosmological parameters between the high and low redshift Universe.

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