Digital philosophy is a direction in philosophy and cosmology advocated by certain mathematicians and theoretical physicists, including: Edward Fredkin, Konrad Zuse, Stephen Wolfram, Rudy Rucker, Gregory Chaitin, and Seth Lloyd.
Digital philosophy is a modern re-interpretation of Gottfried Leibniz's monist metaphysics, one that replaces Leibniz's monads with aspects of the theory of cellular automata. Since, following Leibniz, the mind can be given a computational treatment, digital philosophy attempts to consider some main issues in the philosophy of mind. The digital approach attempts to deal with the non-deterministic quantum theory, where it assumes that all information must have finite and discrete means of its representation, and that the evolution of a physical state is governed by local and deterministic rules.
In Digital physics, existence and thought would consist of only computation. (However, not all computation would be thought.) Thus computation is the single substance of a monist metaphysics, while subjectivity arises from computational universality. There are many variants of digital philosophy; however, most of them are Digital data theories that view all of physical realities and cognitive science and so on, in framework of information theory.
Fredkin takes a radical approach to explaining the EPR paradox and the double-slit experiment in quantum mechanics. While admitting that quantum mechanics yields accurate predictions, Fredkin sides with Einstein in the Bohr-Einstein debates. In The Meaning of Relativity, Einstein writes, "One can give good reasons why reality cannot at all be represented by a continuous field. From the quantum phenomena it appears to follow with certainty that a finite system of finite energy can be completely described by a finite set of numbers (quantum numbers). This does not seem to be in accordance with a continuum theory, and must lead to attempts to find a purely algebraic theory for the description of reality. However, nobody knows how to find the basis for such a description."
Einstein's hope is a purely algebraic theory; however, Fredkin attempts to find a purely informational theory for the description of reality. At the same time, physicists find some vagueness, problems with Bell theorem compatibility, and lack of empirical falsifiability in Fredkin's expression of his ideas. In "Digital Philosophy (DP)", Chapter 11, Fredkin raises the question, "Could physics have a strong law of conservation of information?" Fredkin answers his own question, "If so, we have to rethink particle disintegrations, inelastic collisions and Quantum Mechanics to better understand what is happening to the information. The appearance of a single truly random event is absolutely incompatible with a strong law of conservation of information. A great deal of information is obviously associated with the trajectory of every particle and that information must be conserved. This is a very large issue in DP, yet such issues are seldom considered in conventional physics."
According to Fredkin, "Digital mechanics predicts that for every continuous symmetry of physics there will be some microscopic process that violates that symmetry." Therefore, according to Fredkin, at the Planck scale, ordinary matter could have spin angular momentum that violates the equivalence principle.There might be weird Fredkin forces that cause a torsion in spacetime.
The Einstein-Cartan theory extends general relativity theory to deal with spin-orbit coupling when matter with spin is present. According to conventional wisdom in physics, torsion is nonpropagating, which means that torsion will appear within a massive body and nowhere else. According to Fredkin, torsion could appear outside and around massive bodies, because alternate universes have anomalous inertial effects.