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

  title={Symmetry of Cosmological Observables, a Mirror World Dark Sector, and the Hubble Constant.},
  author={Francis-Yan Cyr-Racine and Fei Ge and Lloyd Knox},
  journal={Physical review letters},
  volume={128 20},
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… 

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