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Spontaneous dimensional reduction in quantum gravity
Published Web Location
https://doi.org/10.1142/s0218271816430033Abstract
Hints from a number of different approaches to quantum gravity point to a phenomenon of “spontaneous dimensional reduction” to two spacetime dimensions near the Planck scale. I examine the physical meaning of the term “dimension” in this context, summarize the evidence for dimensional reduction, and discuss possible physical explanations.
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