Determining the Hubble constant without the sound horizon scale: measurements from CMB lensing

  title={Determining the Hubble constant without the sound horizon scale: measurements from CMB lensing},
  author={Eric J. Baxter and Blake D. Sherwin},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
Measurements of the Hubble constant, $H_0$, from the cosmic distance ladder are currently in tension with the value inferred from Planck observations of the CMB and other high redshift datasets if a flat $\Lambda$CDM cosmological model is assumed. One of the few promising theoretical resolutions of this tension is to invoke new physics that changes the sound horizon scale in the early universe; this can bring CMB and BAO constraints on $H_0$ into better agreement with local measurements. In… 

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