Mass Redistribution Expansion Theory (MRET) v2.1+ Extended Cosmological Framework and Derivations

MRET (Mass Redistribution Expansion Theory) offers a novel alternative to ΛCDM by attributing cosmic expansion, lensing, and structure formation to a geometric scalar field φ(z), sourced by the redistribution of mass in the universe. This extended release, version 2.1+, formalizes the full theoretical framework of MRET, including Lagrangian derivation, redshift-evolving scalar field equations, observational fits, and a diagnostic comparison to ΛCDM.

Key features include:

• A scalar field φ(z) replacing the need for Λ or dark energy

• Accurate fits to H(z), D_A(z), and fσ₈(z) without exotic sectors

• A geometric resolution to the Hubble tension via φ(0)

• First lensing predictions via curvature gradients in φ(x, z)

• A frozen early-universe regime with φ = 0 (no inflation required)

• Appendices detailing parameter choices, figures, and numerical outlines

MRET predicts observable consequences in lensing, void growth, and anisotropies, offering a unified path beyond standard cosmology. This release includes the full manuscript, parameter tables, and simulation summaries.