Grand Cosmological Convergence: Hubble Tension, Sigma-8 Suppression, and Void Fraction as a Unified Pe-Lambda Boundary Layer

Key Points

• The research aims to unify the concepts of Hubble tension and sigma-8 suppression through a specific backreaction term.
• Derivation of equations from a Buchert backreaction term.
• Assessment of void expansion rates using surveys from SDSS/DESI.
• Analysis based on observed cosmic void fraction without introducing new physics.
• Identified a Hubble tension of ΔH₀=5.6 km/s/Mpc.
• Established sigma-8 suppression at 0.749, compared to DES Y3 at 0.745.
• Found void expansion rates at 16.1% consistent with existing surveys.