PIRSA:22040121

A Symmetry of Cosmological Observables: Looking at Hubble through the Mirror

Cyr-Racine, F. (2022). A Symmetry of Cosmological Observables: Looking at Hubble through the Mirror. Perimeter Institute. https://pirsa.org/22040121

Cyr-Racine, Francis-Yan. A Symmetry of Cosmological Observables: Looking at Hubble through the Mirror. Perimeter Institute, Apr. 19, 2022, https://pirsa.org/22040121 

          @misc{ pirsa_PIRSA:22040121,
            doi = {10.48660/22040121},
            url = {https://pirsa.org/22040121},
            author = {Cyr-Racine, Francis-Yan},
            keywords = {Cosmology},
            language = {en},
            title = {A Symmetry of Cosmological Observables: Looking at Hubble through the Mirror},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {apr},
            note = {PIRSA:22040121 see, \url{https://pirsa.org}}
          }

Francis-Yan Cyr-Racine

University of New Mexico

Talk number
PIRSA:22040121
Collection
Talk Type
Subject
Abstract

Many key cosmological observables have a built-in symmetry under rescaling of all important length scales in the problem. This scaling symmetry can be used to make partial progress toward a complete resolution of the Hubble tension. To exploit the symmetry while respecting observational constraints, we are naturally led to a “mirror world” dark sector. A successful implementation of this scaling symmetry requires a means of increasing the cosmic photon scattering rate that respects observational bounds on the primordial helium abundance. We discuss different ideas that could in principle achieve this rescaling, and discuss their advantages and drawbacks. We finally present some general observations about the fundamental nature of the “Hubble tension".

Zoom Link: https://pitp.zoom.us/j/99678466262?pwd=VTY4cWNFUERhU08vYi9lT09MZjJkdz09