The Hubble tension might be resolved by injecting a new energy component, called Early Dark Energy (EDE), prior to recombination. An Anti-de Sitter (AdS) phase around recombination can make the injected energy decay faster, which thus allows a higher EDE fraction (so larger H0) while prevents degrading the CMB fit. In this work, we test the AdS-EDE model with CMB and Large-Scale Structure (LSS) data. Our CMB dataset consists of low-ℓ part of Planck TT spectrum and SPTpol polarization and lensing measurements, since this dataset predicts the CMB lensing effect consistent with ΛCDM expectation. Combining it with BAO and Pantheon data, we find the bestfit values H0=71.92 km/s/Mpc and H0=73.29 km/s/Mpc without and with the SH0ES prior, respectively. Including cosmic shear and galaxy clusters data, we have H0=71.87 km/s/Mpc and S8=0.785, i.e. only 1.3σ discrepancy with direct S8 measurement.
@article{arxiv.2107.07128,
title = {Testing AdS early dark energy with Planck, SPTpol and LSS data},
author = {Jun-Qian Jiang and Yun-Song Piao},
journal= {arXiv preprint arXiv:2107.07128},
year = {2021}
}