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. 2022 May 20;128(20):201301.
doi: 10.1103/PhysRevLett.128.201301.

Symmetry of Cosmological Observables, a Mirror World Dark Sector, and the Hubble Constant

Francis-Yan Cyr-Racine  1 , Fei Ge  2 , Lloyd Knox  2
Affiliations

Symmetry of Cosmological Observables, a Mirror World Dark Sector, and the Hubble Constant

Francis-Yan Cyr-Racine et al. Phys Rev Lett. .

Abstract

We find that a uniform scaling of the gravitational free-fall rates and photon-electron scattering rate leaves most dimensionless cosmological observables nearly invariant. This result opens up a new approach to reconciling cosmic microwave background and large-scale structure observations with high values of the Hubble constant H_{0}: Find a cosmological model in which the scaling transformation can be realized without violating any measurements of quantities not protected by the symmetry. A "mirror world" dark sector allows for effective scaling of the gravitational free-fall rates while respecting the measured mean photon density today. Further model building might bring consistency with the two constraints not yet satisfied: the inferred primordial abundances of deuterium and helium.

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