Postscript: At the End of Geometry and Information
(后记：在几何与信息的尽头)
With the completion of Appendix D, this five-volume work on Foundations of Physics in Geometry and Information finally comes to a close.
Looking back on this intellectual journey, we started from the most microscopic Planck scale, traversed black hole horizons and cosmic frontiers, and finally reached the shores of consciousness and logic. This is not merely a reconstruction of physical laws, but an ontological exploration of “reality” itself.
In Volume I, we established discrete ontology. We had to abandon the illusion of smooth, continuous, infinitely divisible spacetime and accept that the universe at its foundation is a QCA network composed of finite qubits. This shift in perspective allowed us to eradicate infinite divergences in quantum field theory and ground physics on the strict Finite Information Axiom.
In Volume II, we witnessed the emergence of time. Time is no longer an external background parameter, but a statistical property of microscopic scattering processes. The unified time identity tells us that the rate of time flow is essentially the density of matter. We saw how time crystallizes a topological skeleton (time crystals) from disorder, providing solid support for causality.
In Volume III, we revealed the entropic origin of gravity. Einstein’s field equations are no longer divine decrees, but thermodynamic responses of spacetime to maintain holographic entanglement balance. Gravity is entropy force, spacetime is entanglement. This insight naturally led us to derive black hole entropy and the cosmological constant, bridging the century-long gap between general relativity and quantum mechanics.
In Volume IV, we introduced the observer. Physics is no longer a wilderness without people, but a participatory universe containing “subjects.” We defined the algebraic structure of observers and proved that consciousness is a topological soliton in causal networks. We saw that objective reality is not a priori, but a consensus geometry reached by countless subjects in Bayesian games.
Finally, in Volume V, we elevated all of this into metatheory. Category theory proves the logical completeness of this theoretical framework, while experimental proposals pull it from mathematical fantasy back into the realm of testable science. We not only explain the world, but also propose engineering blueprints for constructing artificial consciousness, heralding a paradigm shift in physics from “discovery” to “creation.”
From “It from Bit” to “It from Structure”
Wheeler said “It from Bit.” Through five volumes of argumentation, this book advances this idea one step further: It from Qubit, via Geometry.
Information itself is formless. Only when woven into specific geometric and topological structures (such as MSCC, EWS matrices, fiber bundles) does it manifest as the “physical reality” we perceive—mass, charge, spin, consciousness.
In this picture, mathematics is not the descriptive language of physics, but the ontological skeleton of physics. The universe is a vast geometric body computing itself, and we—conscious observers—are both products of this computational process and its witnesses and participants.
Physics has not ended; it has only just found its grammar. When we close this book, the true exploration—verifying and reconstructing this discrete, holographic, conscious universe in laboratories, chips, and deep space—has only just begun.
(End of Book)