A Global Quantum Probability Distribution Framework for Cosmology and Beyond: Observer Events as Bayesian Informational Interference and the Path Toward a Theory of Everything

We present a unified framework in which the universe is described by a single global quantum probability distribution that is continuously refined by universe observer events — physical correlations that act as objective Bayesian informational updates. While the framework builds upon QBism (Bayesian view of measurement) and holographic dark energy (future-horizon cutoff), it introduces several original elements: a precise, objective definition of a Universe Observer Event (UOE) as the minimal process generating at least one bit of mutual information; a convergence theorem showing that, in the limit of infinite sampling, local descriptions converge to the true global distribution; an informational-pressure interpretation of dark energy arising from the expansion needed to accommodate increasing samples; and a dynamical selection mechanism in which the Standard Model parameters emerge as stable fixed points of the global Bayesian update superoperator. This minimal postulate resolves the measurement problem without ad-hoc collapse, derives emergent spacetime and gravity from holographic sampling of entanglement, explains dark sectors as unobserved probability regions, and naturally accounts for the small cosmological constant and the ``why now?'' coincidence. The framework predicts a mildly phantom and time-varying equation of state \(wDE(z)\) distinguishable from \(Λ\)CDM, testable with near-future data from DESI, Euclid, and LISA. It offers a concrete, observer-centric path toward a Theory of Everything in which all physical laws and the emergence of life and consciousness arise from the universe's continuous self-description through informational updates.