Early dark energy reconciles the different ‘thermometers’ of the Universe ⚡ экспресс
Observations of distant galaxies by JWST and baryon acoustic oscillations from DESI seriously test the standard ΛCDM model, exacerbating the Hubble tension (H₀). The ability of the early dark energy (EDE) model, within a canonical axion EDE variant, to alleviate this tension is investigated using data from: Planck, ACT, SPT cosmic microwave background; DESI baryon acoustic oscillations; and JWST ultraviolet luminosity functions of galaxies. A joint analysis of CMB+DESI+JWST raises H₀ to 71.58±1.05 km/s/Mpc, reducing the tension to 1.0σ. The model also improves the fit to JWST data and shows statistically significant superiority over ΛCDM: Δχ²_total = -18.26, ΔDIC = -11.89. These results highlight the synergy between JWST high-redshift galaxy data and both early- and late-time cosmological observations for testing EDE and resolving the H₀ tension.
For decades, two ways of measuring the speed at which galaxies fly apart gave conflicting numbers—like two thermometers in the same room with different readings. One relied on nearby stars, the other on the ancient light of the Big Bang. Adam Riess used supernovae to get a value of about 73, while the Planck satellite got 67 from the cosmic microwave background (in arbitrary units).
Astronomers added observations of early galaxies from the James Webb Space Telescope and the DESI sound wave map, along with the hypothesis of a brief burst of dark energy at the dawn of time. It’s as if one of the thermometers got caught in a warm draft for a moment—its reading rose slightly, and the discrepancy almost disappeared.
Early dark energy is not the same force that accelerates the Universe today. It was a fleeting push of ‘antigravity’ that vanished before the first stars appeared. Its trace: the patterns of ancient light became slightly blurred (by a few percent), which smoothed out the dispute. Thus, the standard model of the cosmos got a fine-tuning, and the Expansion of the Universe is described without conflict.
🎯 In the brief moment when early dark energy was active, the Universe may have expanded more than it did in the billions of years that followed.