Papers › The early dark energy resolution to the Hubble tension in light of weak lensing...
The early dark energy resolution to the Hubble tension in light of weak lensing surveys and lensing anomalies
Riccardo Murgia, Guillermo F. Abellán, Vivian Poulin
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Early Dark Energy (EDE) contributing a fraction f_(EDE)(z_c)∼10 % of the energy density of the universe around z_c≃3500 and diluting as or faster than radiation afterwards, can provide a resolution to the Hubble tension, the ∼5σ discrepancy between the H₀ value derived from early- and late-universe observations within ΛCDM. However, it has been pointed out that Large-Scale Structure (LSS) data, which are in ∼3σ tension with ΛCDM and EDE cosmologies, might alter these conclusions. We reassess the viability of the EDE against a host of high- and low-redshift measurements, by combining LSS observations from recent weak lensing (WL) surveys with CMB, Baryon Acoustic Oscillation (BAO), growth function (FS) and Supernova Ia (SNIa) data. Introducing a model whose only parameter is f_(EDE)(z_c), we report a ∼2σ preference for non-zero f_(EDE)(z_c) from Planck data alone and the tension with SH0ES is reduced below 2σ. Adding BAO, FS and SNIa does not affect this result, while the inclusion of a prior on H₀ from SH0ES increase the preference for non-zero EDE to ∼3.6σ. After checking the EDE non-linear matter power spectrum predicted by standard semi-analytical algorithms via a set of N-body simulations, we show that current WL data do not rule out EDE. We also caution against the interpretation of constraints obtained from combining statistically inconsistent data sets within the ΛCDM cosmology. In light of the CMB lensing anomalies, we show that the lensing-marginalized CMB data also favor non-zero f_(EDE)(z_c) at ∼2σ, predicts H₀ in 1.4σ agreement with SH0ES and S₈ in 1.5σ (0.8σ) agreement with KV (DES) data. Alternatively, we discuss promising extensions of the EDE cosmology that could allow to fully restore cosmological concordance.
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