A self-contained universe or world; a system that is complete and independent unto itself, with all necessary laws and structures built within it.
From auto- (self) + cosm (from Greek kosmos, universe or order). A philosophical and scientific term describing self-sufficient systems or thought experiments.
When physicists simulate universes inside computers with different physics laws, they're creating autocosms—mini-universes that follow completely self-contained rules, which helps them understand why our own universe might have the particular laws it does.
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