Spontaneous Dimensional Reduction in Quantum Gravity
arXiv:1605.05694 · doi:10.1142/S0218271816430033
Abstract
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.
Third award, 2016 Gravity Research Foundation Essay Contest