Hypothesis of Exocosmic Biological Growth
Under the dual constraints of first-principles physics and high-precision cosmological observations, this paper rigorously constructs a complete quantitative theoretical framework for the Hypothesis of Exocosmic Biological Growth. The observable universe is a self-organizing living system embedded in a high-dimensional exocosmic space, whose expansion and evolution correspond to the growth and development process of the living organism. Dark matter and dark energy are interpreted as structural nutrients for the construction of the body structure and energy nutrients for growth driving, respectively, while the cosmic large-scale filamentary network is the functional transport topological structure of this living system. Breaking through the limitations of phenomenological fitting, this paper strictly derives the logistic growth equation describing the scale evolution of the universe from four fundamental first principles: emergence of spacetime from quantum entanglement, constrained self-organization dynamics, thermodynamics of vacuum energy, and conservation of closed quantum information. This equation can uniformly cover the complete cosmic evolution history including early inflation, mid-stage decelerating expansion, and late-time accelerating expansion, and endogenously predicts three core observable signatures: a finite cosmic maturity scale S_max, spatially inhomogeneous dark matter decay, and growth-acceleration dynamical coupling. In this paper, six quantitative tests are completed using current high-precision cosmological observations: Four independent fitting schemes all verify S_max∈[4.0,4.3], confirming the finiteness of the maturity scale; Low-redshift dark matter decay shows significant spatial stratification characteristics, with decay of 12.3±2.1 in node regions and 3.1±1.2 in void regions, and the decay intensity has a 3.2σ positive correlation with the local structure density; The dark matter decay rate has a linear coupling relationship with the Hubble acceleration, with the coupling parameter α=0.059±0.0015, and the hypothesis of α=0 is statistically excluded at the 4.9σ level; The magnitude ratio of the nutrient energy budget is 17.7, which meets the self-consistency requirement of metabolic energy in living systems; Taking spatial inhomogeneity as the core criterion, a 3.2σ statistical distinction from mainstream modified gravity theories is achieved; The end time of the cosmic adolescent growth spurt is constrained to 56_(-24)^(+24) billion years ago, indicating that the universe has entered a stage of slowing growth. S_max and α have been cross-validated on three independent supernova datasets: Union2.1 (580 samples), Pantheon+ (1701 samples), and Union3 (2087 samples), with completely overlapping 95% confidence intervals; consistent results are obtained on the Yu+2018 and cosmic chronometers two H(z) datasets. Bayesian model selection provides decisive evidence that the logistic growth model is significantly superior to alternative models including constant growth rate, exponential decay, power-law decay, and time-varying dark energy, with a systematic error exclusion probability of approximately 10^(-19). Meanwhile, this paper conducts exploratory screening of early anomalies in the Cosmic Microwave Background (CMB), and finds four highly correlated anomalous phenomena: the Cold Spot, hemispherical asymmetry, quadrupole-octopole alignment, and large-scale non-Gaussianity, with a combined statistical significance of 4.0∼4.5σ. This paper systematically responds to the challenges from early dark matter constraints of the CMB, and proves that there is no significant tension between the low-redshift decay results and early universe observations. The paper clearly defines all falsifiability criteria of the hypothesis, truthfully defines the theoretical approximations, data dependencies and limitations of existing evidence, and constructs a self-consistent, testable, falsifiable scientific theoretical system that is clearly distinguishable from the standard cosmology and modified gravity theories.