Exploring an early dark energy solution to the Hubble tension with Planck and SPTPol dataстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 7 июля 2021 г.
Аннотация:A promising idea to resolve the long standing Hubble tension is to postulate a new subdominant dark-energy-like component in the pre-recombination Universe which is traditionally termed as the Early Dark Energy (EDE). However, as shown in Refs. \cite{Hill:2020osr,Ivanov:2020ril} the cosmic microwave background (CMB) and large-scale structure (LSS) data impose tight constraints on this proposal. Here, we revisit these strong bounds considering the Planck CMB temperature anisotropy data at large angular scales and the SPTPol polarization and lensing measurements. As advocated in Ref. \cite{Chudaykin:2020acu}, this combined data approach predicts the CMB lensing effect consistent with the ΛCDM expectation and allows one to efficiently probe both large and small angular scales. Combining Planck and SPTPol CMB data with the full-shape BOSS likelihood and information from photometric LSS surveys in the EDE analysis we found for the Hubble constant H0=69.79±0.99kms−1Mpc−1 and for the EDE fraction fEDE<0.094(2σ). These bounds obtained without including a local distance ladder measurement of H0 (SH0ES) alleviate the Hubble tension to a 2.5σ level. Including further the SH0ES data we obtain H0=71.81±1.19kms−1Mpc−1 and fEDE=0.088±0.034 in full accordance with SH0ES. We also found that a higher value of H0 does not significantly deteriorate the fit to the LSS data. Overall, the EDE scenario is (though weakly) favoured over ΛCDM even after accounting for unconstrained directions in the cosmological parameter space. We conclude that the large-scale Planck temperature and SPTPol polarization measurements along with LSS data do not rule out the EDE model as a resolution of the Hubble tension. This paper underlines the importance of the CMB lensing effect for robust constraints on the EDE scenario.