Does every choice you make create a new universe?
In short: This interview explores the Many Worlds Interpretation of quantum mechanics with physicist Sean Carroll. It moves past the sci-fi tropes to examine whether branching universes are a mathematical necessity or just a different kind of mystery.
The discussion tackles the core tension between the Copenhagen interpretation—where the wave function 'collapses'—and Many Worlds, where the wave function never collapses but instead branches. Carroll addresses critical technical hurdles, including how the Born Rule (which determines probability) functions in a world where every outcome occurs, and how energy conservation is maintained as new branches emerge.
Key concepts explored include decoherence, the process that causes branching, and the distinction between the Many Worlds Interpretation and the 'multiverse' predicted by string theory. The interview also seeks to clarify why we only perceive a single timeline and whether the theory is actually testable by science.
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Sources
- Summary by Intellect · source: Skeptic interviews Sean Carroll. Many Worlds Theory - Real or fake?
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