An ultralight dark photon that behaves as radiation before z~6000 and as cold dark matter afterward is claimed to reduce the BAO sound horizon by 6% and raise the inferred Hubble constant to 73 km/s/Mpc.
We consider an implication of the massive-vector-field extended ΛCDM model to resolve the Hubble tension
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Ultralight dark photon as a model for early universe dark matter
An ultralight dark photon that behaves as radiation before z~6000 and as cold dark matter afterward is claimed to reduce the BAO sound horizon by 6% and raise the inferred Hubble constant to 73 km/s/Mpc.