Cosmothermodynamics: A Causal-Informational Framework for the 2026 Dark Energy 'Withering' and Primordial Information Sinks

Overview This manuscript provides the formal theoretical framework for Cosmothermodynamics (CTD), a paradigm shift in cosmology that replaces the static cosmological constant ($\Lambda$) with a dynamic informational feedback mechanism. The 2026 Context Building upon the 4.2$\sigma$ 'withering' dark energy signal reported by the Dark Energy Spectroscopic Instrument (DESI) in early 2026, this paper derives the Information-Friedmann Equation. We demonstrate that the observed decay in expansion acceleration is a direct result of the universe reaching Computational Maturity—a state where the informational rendering overhead of the metric asymptotically declines as large-scale structural complexity stabilizes. Key Solutions & Mechanisms Information Sinks: A first-principles resolution to the JWST 'Impossible' Black Hole paradox (e.g., Abell 2744-QSO1). We define Sinks as primordial metric collapses triggered when local bit-density exceeds the Bekenstein-Hawking bound. The Rendering Hypothesis: A proposal that metric expansion is the thermodynamic work required to process cosmic state-vectors. Hubble Tension Resolution: A complexity-weighted convergence of $H_0$ to 71.4 km/s/Mpc. Predictive Roadmap (2026–2030) This version includes five falsifiable predictions for upcoming missions, including a B-mode polarization floor of $r \approx 0.002$ and the anticipated discovery of 'Naked Sinks' by the Nancy Grace Roman Space Telescope.