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Extra spatial dimensions are required for string theory to consistently incorporate gravity and particle physics.
“the catch in string theory is that this beautiful formulation I just described of, you know, you can describe all of particle physics by one little extended object. You get gravity for free only seems to work if the universe that this happens in has more than three spatial dimensions”
StarTalk · Jun 2025 · 1 episode · 1.3M views on this topicExtra spatial dimensions are hypothesized but remain undetectable due to their compactified nature.
“One of the well known formulations of this, is something called a Compactified dimension.”
StarTalk · Oct 2019 · 1 episode · 274K views on this topicExtracted by a model; may misattribute who said what.