Do we live in a simulation?

Lens adapted to this topic: What mainstream science can and cannot establish

Mainstream scientific treatments generally regard the simulation hypothesis as speculative rather than an established explanation. The strongest arguments are conditional philosophical reasoning and proposals for possible tests, not observations showing that reality is simulated. Astrophysical analyses further argue that simulating the observable universe, or even Earth at very fine resolution, would demand resources that appear physically unrealistic under known constraints.

• Astrophysical analysis argues that simulating the entire visible universe, Earth at Planck-scale resolution, or Earth with sufficiently detailed particle interactions would require implausible computational resources.
• Scientific discussion treats possible tests as exploratory: proposed signatures or experiments might constrain particular simulation models, but no source reports a confirmed detection.
• The simulation argument depends on assumptions including that consciousness could arise on non-biological computational substrates and that advanced civilizations would run many ancestor-simulations.
• On this evidence, the hypothesis remains a philosophical possibility rather than a demonstrated scientific conclusion.

Lens adapted to this topic: Arguments that simulation remains plausible, and their objections

Dissenting arguments hold that ordinary physical reality is not the only rational possibility. Bostrom’s reasoning suggests that if advanced civilizations survive and create vast numbers of conscious simulations, simulated observers could outnumber original observers. Some writers also argue that computation-like features of physics or proposed experiments may offer clues. Critics within this lens challenge whether Bostrom’s probability inference is valid and whether purported physical clues are decisive.

• Bostrom’s argument says that if posthuman civilizations create many conscious ancestor-simulations, most observers with experiences like ours could be simulated rather than original.
• A dissenting philosophical analysis argues that Bostrom’s trilemma can be accepted while rejecting the separate inference that we ourselves are probably simulated.
• Some physicists and commentators regard possible computational structure in physical laws as a reason to investigate the hypothesis, while acknowledging that such clues are not conclusive.
• The hypothesis is difficult to refute from inside the proposed simulation, since all observations could in principle be generated by the simulator; this creates a problem for decisive confirmation or falsification.