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The analysis explores why baryonic back-reaction is insufficient to explain the observed cosmic growth plateau.

January 23, 2026Open Access

Baryonic Back-Reaction and the Late-Time Growth Plateau (γ ≈ 0.63)

Key Points

The analysis explores why baryonic back-reaction is insufficient to explain the observed cosmic growth plateau.
Utilized data from Euclid SC8 and DESI DR2.
Incorporated X-ray and SZ gas-fraction constraints.
Conducted state-of-the-art numerical simulations.
The baryonic feedback lacks the scale-independence required for plateau reproduction.
Baryonic feedback is essential at small scales but insufficient for large-scale effects.
Need for a structural, non-baryonic mechanism highlighted for late-time cosmic growth.

Abstract

This video presents a concise overview of the January 2026 analysis showing that baryonic back-reaction cannot account for the observed late-time growth plateau γ ≈ 0.63. Drawing on Euclid SC8, DESI DR2, X-ray and SZ gas-fraction constraints, and state-of-the-art numerical simulations, it explains why baryonic feedback—although essential at small scales—lacks the magnitude, scale-independence, and redshift invariance required to reproduce the plateau. The results highlight the need for a structural, non-baryonic mechanism governing late-time cosmic growth.

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