Closed Physical Kernels as Admissibility Gates

This paper establishes closed physical kernels as admissibility gates rather than as dynamical substrates or generative mechanisms. Physical kernels are treated as fixed constraint loci that license which descriptions are admissible, not as entities that evolve, optimize, or produce outcomes. By exhaustion, any attempt to treat kernels as extensible, parametrically adjustable, or explanatory engines is shown to violate standing and fail closed. The analysis is structural and non-procedural, clarifying how physical kernels bound admissible theory formation while avoiding algorithms, construction steps, or operational criteria.