Early Dark Energy can Resolve the Hubble Tension.

@article{Poulin2019EarlyDE,
  title={Early Dark Energy can Resolve the Hubble Tension.},
  author={Vivian Poulin and Tristan L. Smith and Tanvi Karwal and Marc Kamionkowski},
  journal={Physical review letters},
  year={2019},
  volume={122 22},
  pages={
          221301
        }
}
Early dark energy (EDE) that behaves like a cosmological constant at early times (redshifts z≳3000) and then dilutes away like radiation or faster at later times can solve the Hubble tension. In these models, the sound horizon at decoupling is reduced resulting in a larger value of the Hubble parameter H_{0} inferred from the cosmic microwave background (CMB). We consider two physical models for this EDE, one involving an oscillating scalar field and another a slowly rolling field. We perform a… 

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