Physics-adjacent worldview theories evidence.
Many-worlds, simulation, mathematical universe. This hub collects the relevant claims, strongest and weakest evidence positions, source records, and map/library views for the cluster.
Strongest claims in this topic
Does time exist?
Umbrella entry for the time question. Time, in some real sense, undeniably organises both experience and physics. Whether it is fundamental, emergent, or illusory is what's actually contested.
Block Universe / Eternalism
The 4D 'block' picture follows naturally from special relativity, where there is no objective universal 'now'. Many physicists and philosophers accept it.
Emergent time
If quantum gravity is right, time may be derived rather than fundamental. Active research; nothing settled.
Many-Worlds Interpretation
Everett's solution to the measurement problem. No collapse — every outcome happens in branching universes.
Growing Block Universe
The past is real and growing. The future is not yet. A compromise that preserves becoming.
Presentism — only the present is real
The natural common-sense view: only what exists now exists. Hard to reconcile with relativity but not refuted.
Weakest or most speculative claims
Boltzmann brains
In a long-lived, accelerating universe, random thermal fluctuations could spontaneously assemble a self-aware brain with false memories of a coherent life. Several modern cosmological models appear to predict such observers should statistically dominate — which is widely treated as a reason those models are wrong, not as evidence about you.
Mathematical Universe Hypothesis
Max Tegmark's claim that physical existence and mathematical existence are the same thing.
Pantheism — the universe is divine
The view that the universe and God are identical — divinity is not separate from nature but is nature itself, in its totality.
Simulation Theory
Nick Bostrom's 2003 trilemma: civilizations don't reach the simulation stage, or don't run simulations, or we are almost certainly in one. The argument is rigorous; whether any horn is true is empirically open.
Key verified sources
The clearest statement of how the Boltzmann-brain count is tamed by a finite vacuum lifetime; companion paper to 'Return of the Boltzmann brains'.
Sets up one of the main physical pathways for resolving the paradox — vacuum decay into terminal states before BBs can dominate.
One of the canonical modern statements of the Boltzmann-brain comparison and its implications for inflation.
The paper that reignited modern interest in the Boltzmann-brain problem by linking it directly to the accelerating expansion of our universe.
Is our universe likely to decay within 20 billion years?
The clearest statement of how the Boltzmann-brain count is tamed by a finite vacuum lifetime; companion paper to 'Return of the Boltzmann brains'.
Sinks in the Landscape, Boltzmann Brains, and the Cosmological Constant Problem
Sets up one of the main physical pathways for resolving the paradox — vacuum decay into terminal states before BBs can dominate.
Can the universe afford inflation?
One of the canonical modern statements of the Boltzmann-brain comparison and its implications for inflation.
Disturbing Implications of a Cosmological Constant
The paper that reignited modern interest in the Boltzmann-brain problem by linking it directly to the accelerating expansion of our universe.
Why Boltzmann Brains Are Bad
The standard reference for the cognitive-instability resolution and the philosophical case against taking Boltzmann-brain dominance as a real prediction.
Why Boltzmann Brains Don't Fluctuate Into Existence From the De Sitter Vacuum
Major physical objection to Boltzmann-brain dominance: the static de Sitter vacuum is sterile, so the mathematical fluctuation probability does not translate into real observers.
The Unreality of Time
Gives the time-exists page a canonical anti-realist anchor rather than treating the question as only a physics issue.
Fine-Tuning
Frames the anthropic / multiverse / design debate that simulation, mathematical-universe, and theism claims all engage with.
Pantheism
Reference for claims that the universe itself is divine or conscious; it helps keep poetic, religious, and metaphysical versions of the claim distinct.
Everett's Relative-State Formulation of Quantum Mechanics
Steel-manned reference for what the many-worlds interpretation actually says, useful because popular versions often overstate what the physics entails.