Alternative Cosmological Model (AMC): Closing the Hubble Tension (Late-Time) and Addressing the Early-Structure Timeline Tension (JWST Galaxies vs. High-z SMBHs)

I would like to share a manuscript presenting two concrete tensions where AMC produces quantitative, falsifiable implications: Late-time sector of the Hubble tension The manuscript reports a late-time closure test in which AMC is fit simultaneously to standard SNe Ia and BAO datasets, with explicitly reported fit quality and an inferred BAO sound-horizon scale. The goal is not a purely phenomenological adjustment, but a constrained framework that can be checked and reproduced. Early-structure timeline tension (JWST galaxies vs. high-z SMBHs) A central part of the manuscript derives an AMC chronology mapping and evaluates Age(z) and the time gain Δt(z) relative to a ΛCDM baseline up to z≈30. This directly targets the “too early” formation challenge suggested by spectroscopically confirmed high-z galaxies and z≳7 quasars with ~10^9 M⊙ SMBHs. The document then translates the chronology into an Eddington-based SMBH growth feasibility analysis (seed-redshift scenarios, duty cycle, growth tracks), including feasibility maps and an uncertainty addendum that makes clear what assumptions drive the outcome and what data would be decisive. Reproducibility and falsifiability Where possible, the manuscript provides an explicit numerical baseline parameter set used for the Age(z)/Δt(z) evaluations, and it propagates quoted redshift uncertainties into age ranges where available. The intent is to make the analysis directly verifiable by independent readers. The work also states clearly what would falsify AMC in this context—for example, improved measurements of redshifts, SMBH masses, and Eddington ratios that eliminate the required time-budget relief or exclude the feasible growth region under conservative assumptions. Appendix A — Roadmap and planned upgrades (invitation to collaborate) The manuscript includes “Appendix A — Roadmap and planned upgrades,” which is explicitly meant as an open invitation to collaboration. It lists concrete, bounded upgrades that would strengthen the work (expanded object samples, baseline/uncertainty propagation, and robustness extensions). If any of these items align with your expertise or interests, I would genuinely welcome joint checking, replication, or extension efforts. Thank you in advance for any comments or guidance you can offer. Best regards,Valentin Ionescu