An Early Dark Energy model can fit H0=73.56 km/s/Mpc only with a high EDE fraction and high peak redshift, while Bayesian evidence favors the model only in a narrow, finely-tuned parameter space.
Interactions between photons and baryons in this fluid created perturbations in the plasma which propagated at the speed of sound
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Beyond LambdaCDM: How the Hubble tension challenges early universe physics
An Early Dark Energy model can fit H0=73.56 km/s/Mpc only with a high EDE fraction and high peak redshift, while Bayesian evidence favors the model only in a narrow, finely-tuned parameter space.