Thought Experiment on the Ultimate Reduction of the Universe: Layered Retreat from Manifest Structures to the K0 Primordial Field (Version 2.0)

Taking "deconstruction as topological regression and evolution as topological manifestation" as the core principle and the general relational dissolution recursive logic as the unified methodology, this paper conducts a thought experiment on the ultimate reduction of the universe pushed to the logical extreme. Starting from macroscopically observable condensed matter, we layer by layer dissolve the topological constraint relations of manifest structures, and gradually internalize and retreat the manifest properties of molecules, atoms, nucleons, quantum fields, and even spacetime, mass-energy and information. Finally, we logically derive the ultimate irreducible substrate of the universe—the K0 zero-state primordial field. This paper strictly defines the mathematical-physical properties and ontological characteristics of the K0 field, establishes a self-consistent bidirectional logical framework of "manifestation-retreat symmetry", proves that all physical processes follow the unified law of "natural selection + topological conservation", and provides a rigorous and speculative new perspective for the fundamental problems of physics. Keywords Reductionism thought experiment; K0 zero-state primordial field; Hidden-manifest symmetry; Topological constraint; Recursive logic; Harmonic vector field; Hydrogen atom ionization; Matter-antimatter annihilation; Quantum field theory; Fundamental physics origin