Falsifiable Observational Predictions of a Thermodynamically Bounded Universe: Strict Numerical Targets from CODATA Horizon Limits

Abstract

This repository contains the official brief report of strict, parameter-free observational predictions derived directly from the thermodynamic boundary framework published in DOI: 10.5281/zenodo.21498832. By modeling the spacetime manifold as a closed, non-isolated thermodynamic system constrained by the macroscopic mass target of the CODATA framework (M_CODATA ≈ 1.50 x 10^53 kg, designated as Scenario 1), this work bypasses ad-hoc fluid parameters and curve-fitting, offering definitive, quantitative, and falsifiable targets for next-generation astrophysical and cosmological observatories. Key Predictive Targets and Falsifiable Signatures: Dark Energy Fraction: Derived from Landauer's thermodynamic processing cost on the de Sitter horizon, fixing the dark energy density at exactly ln(2) ≈ 69.31% of the total cosmic budget. Resolution of the Vacuum Catastrophe: The macroscopic informational cutoff eliminates the 10^114 J/m³ Quantum Field Theory divergence, yielding an effective dark energy density of ρ_1 ≈ 2.017 x 10^-10 J/m³. Hubble Tension Ceiling: Modulated by the first Costa constant (Λ_CC ≈ 1.5199), establishing a strict local expansion ceiling of 73.00 km/s/Mpc for standard sirens. Equation of State (w_eff): Restricts the deviation from a cosmological constant to a residual decay factor of ε_1 ≈ 8.75 x 10^-126, analytically proving that a "Big Rip" scenario is thermodynamically prohibited. S_8 Structure Suppression: Introduces a macroscopic elastic screening mechanism on the gravitational coupling (G_eff,1) governed by the volumetric tension rigidity Φ_1 ≈ 8.8533. Galactic Rotation Kinematics (Absence of Dark Matter): The projection of energy and informational constraints yields a strict orbital velocity multiplier of Φ_1^(1/4) ≈ 1.72, rendering particulate dark matter halos redundant. CMB Thermal Scars: Linked to Penrose's Conformal Cyclic Cosmology, the topological boundary limit restricts the maximum angular diameter of primordial coherent anomalies ("Axis of Evil") to exactly Θ ≈ 78.54°. Graviton Compton Mass Floor: The spatial confinement imposed by the maximal horizon radius yields an irreducible effective mass limit for the graviton of 8.86 x 10^-34 eV/c².