Comparisons

How Observer-Centrism relates to other frameworks in physics

Observer-Centrism is one attempt among many to get underneath the physics we already have. These pages set it beside the other serious attempts — what each takes as fundamental, where the conclusions coincide, and where they genuinely conflict.

The aim is comparison, not competition. Each framework here is described as its own proponents would describe it, and taken at its strongest. Where this framework disagrees, the disagreement is stated plainly and the reason given; where another program got somewhere first, or got somewhere this one cannot reach, that is recorded too. A comparison that only flattered the home team would not be worth writing.

Quantum Foundations & Interpretations

Relational Quantum Mechanics The nearest kin — same instinct about facts, different ambitions about physics Shared There are no absolute, observer-independent quantum facts; states are relative to a physical system, every system counts equally as an observer, and nothing about consciousness or macroscopicity enters. Rovelli reached this in 1996 and the framework agrees with almost all of it. Diverges RQM takes relationality as an interpretive premise and stops there, leaving quantum dynamics as given. The framework treats relationality as a consequence of a structural definition of what an observer is, and then tries to derive the dynamics and the particle spectrum from that same definition. QBism The same refusal of a view from nowhere, grounded in structure rather than belief Shared There is no observer-free quantum state. The wavefunction is not an item in the furniture of the world, measurement is a real event for the one who undergoes it, and the observer belongs inside physics rather than outside it. Diverges QBism grounds the quantum state in an agent's personal degrees of belief and reaches the Born rule as a norm on coherent gambling. The framework grounds it in a structural observer — the triple (Σ, I, B), satisfied by a proton — and derives the Born rule as a uniqueness theorem, leaving the observer no latitude at all. Everettian Quantum Mechanics One wavefunction taken seriously, and what it costs to keep every branch Shared Both refuse the collapse postulate and take unitary evolution as exact at every scale, with measurement treated as ordinary physics rather than a separate kind of process. Both accept that the appearance of a definite outcome is a fact about a subsystem, not about the universe. Diverges Everett keeps observer-independent realism by multiplying branches, and recovers the preferred basis and the Born rule from decoherence plus decision theory. The framework keeps a single closed coherence ledger, derives the basis from the relational invariant an interaction actually generates, and derives the Born rule from coherence conservation — at the price of accepting that outcomes are observer-relative. Bohmian Mechanics A world without observers, built to answer the same question Shared Both refuse to treat measurement as primitive physics, both deny that the wavefunction ever collapses, and both insist that something definite actually happens when an experiment ends. Diverges Bohm builds an observer-free ontology of particles guided by a wave and pays for it with a preferred foliation and an equilibrium hypothesis; the framework builds everything on observers, derives Lorentz invariance rather than straining against it, and derives the Born rule rather than assuming it holds initially.

Quantum Gravity

Causal Set Theory The same discrete order, arrived at from the opposite end Shared The same mathematical object sits at the bottom of both programs: a locally finite partial order of events, Poisson-sprinkled so that discreteness costs no Lorentz invariance. The framework does not merely resemble causal set theory here — it uses its theorems. Diverges Causal sets take the partial order as the primitive and work outward toward geometry and matter. The framework takes observers as primitive and obtains the partial order as a theorem about directed phase transfer, which buys it a particle spectrum and gauge structure at the cost of assuming more ambient geometry. Loop Quantum Gravity Two discrete Planck worlds, entered from opposite ends Shared Both hold that geometry is discrete at the Planck scale, both refuse a fixed background, and both replace the initial singularity with a bounce — and the framework's leading-order bounce equation is the same one loop quantum cosmology reached independently. Diverges LQG starts from general relativity and quantizes the gravitational field it finds there. The framework never starts from a metric: geometry is a projection of observer structure, so there is no pre-existing geometric field to quantize. String and M-Theory The most developed unification program, and a young framework that disagrees with it Shared Both treat gravity as something that must emerge rather than be added by hand, both take holography seriously as a statement about how information lives on boundaries, and both expect the deep structure of physics to be fixed by consistency rather than by fitting. Diverges String theory buys uniqueness at the top and pays for it with choices below — ten or eleven dimensions, a compactification, a vacuum. The framework refuses the extra structure and tries to force the low-energy content directly: three spatial dimensions derived, the gauge group from division algebras, and no supersymmetry at any scale. Holography and AdS/CFT The same house, entered through the observer's door Shared Area-scaling entropy bounds, ER=EPR, unitary evaporation with a Page curve, fast scrambling, and the equivalence of a bulk state with boundary data. The framework reaches all of these, and in most cases it is reconstructing them rather than superseding them. Diverges AdS/CFT is a duality between two distinct theories across a global asymptotic boundary in negatively curved space. The framework treats area-scaling as near-definitional rather than dual, and locates holography on the null horizon that every observer carries — in a universe where Λ is forced positive.

Emergent & Informational Approaches

Thermodynamic and Entropic Gravity The closest kin — the framework walks Jacobson's road, and says so Shared Gravity is not a fundamental force but a thermodynamic relation on causal horizons: heat, temperature and entropy on a local Rindler horizon are enough to produce the Einstein equations. The framework uses Jacobson's Clausius argument directly, and reaches G = c⁴/(4ħη) by it. Diverges For Jacobson and Padmanabhan the thermodynamic route is the derivation of the field equations; in the framework it is one convergent constraint on the coupling, while the equations themselves are fixed by conservation plus Lovelock uniqueness. And the framework's horizon thermodynamics is per-observer and level-indexed rather than global. Constructor Theory An entity that can do it again — the closest thing to an observer anyone else has written down Shared Both frameworks make persistence-through-action the primitive: constructor theory's constructor causes a transformation and retains the ability to cause it again, which is almost exactly the framework's loop closure. Both then use that primitive to state exact, non-statistical versions of information-theoretic and thermodynamic laws. Diverges Constructor theory takes counterfactual possibility and impossibility as fundamental and is deliberately a meta-theory — a language other theories are expressed in. The framework takes a conserved coherence measure as fundamental and is a first-order theory that claims a specific particle spectrum, a specific spacetime, and quantitative predictions. The Wolfram Physics Project A discrete substrate reached by exploration rather than by exclusion Shared Both treat the continuum as derived rather than fundamental, build spacetime from a discrete relational structure with no background, and put the observer at the centre of the explanation rather than at the edge of it. Diverges Wolfram explores a vast space of rewriting rules and asks which ones produce our physics; the framework constrains the substrate by demanding that observers persist, and derives its structure by exclusion. Wolfram's substrate is fundamental and the continuum is its limit; the framework treats the two as co-formed duals.

Cosmology

Turok's CPT-Symmetric Cosmology Parallel conclusions in cosmology, reached by different mechanisms Shared A passable Big Bang, a gravitational temperature, a neutrino seesaw — and a shared minimalist temperament that distrusts added structure. Diverges Turok's organizing principles are global and symmetry-based; the framework's are local and observer-based. Turok treats conformal invariance as near-fundamental; the framework treats it as earned and sector-specific. Conformal Cyclic Cosmology Two cosmologies that close the same loop for opposite reasons Shared Both are genuinely cyclic cosmologies with no privileged first cycle; both require scale to lose its meaning at the transition; and both treat the arrow of time and the low-entropy past as the central things a cosmology is obliged to explain rather than assume. Diverges Penrose strips scale away with conformal invariance and passes through the bang as a smooth conformal boundary. The framework strips it away with epistemic capacity — when only one-bit observers remain, duration and extent have no referent — and forbids the singularity outright, replacing it with a Planck-density bounce.