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P5: The Universe Has No Boundary: Logical, Derivational, and Observational Arguments for Spatial Infinitude

Year: 2026
Type: preprint
Abstract: This paper presents three independent categories of argument that the universe is spatially infinite and has no physical boundary. The first is conceptual: a physical boundary of space is incoherent because a boundary requires a physically meaningful distinction across it, whereas absolute non-being cannot function as a physical interface. The second is logical: the standard cosmological model's own answer to the question of where the Big Bang singularity was located, namely that it was everywhere, undermines any finite localised-origin premise. The third is derivational and observational within the BFUT framework: the cosmological constant Λ provides a geometric correspondence to the equilibrium density of the Spaticle field, ρₛ = 7.3 × 10⁻²⁷ kg/m³, independently established within BFUT; current large-scale orientation evidence does not establish a single robust global preferred axis consistent with a finite-boundary cosmology; and large-scale ordered motion persists in rotating cosmic filaments, cluster-scale coherent motion, and multi-megaparsec environmental coherence beyond the scale at which naive finite-expansion reasoning would expect such coherence to be washed out. Standard responses are then examined - finite-but-unbounded topology, singularity-era breakdown claims, and inflationary patches - and shown either to change the question, relocate the boundary condition, or introduce additional assumptions without direct confirmation. The paper concludes that spatial infinitude is not merely one cosmological option but the most coherent physical interpretation within the BFUT framework. The paper is part of a series presenting components of the Big Flare-Up Theory (BFUT) [2], a comprehensive alternative cosmological framework proposing an infinite eternal universe. The spatial infinitude argument presented here is foundational to BFUT but can be evaluated entirely independently of the other BFUT claims.
DOI: 10.5281/zenodo.19242759
Language: English
Open Access status: green
OpenAlex ID: W7140843462
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