2017/05/29 by S. Carlip · 2 citations
Physics and Astronomy · #gr-qc #hep-th
paper · pdf · doi:10.1088/1361-6382/aa8535
33 page draft of solicited review article -- comments and added references welcome; v2: many added references, minor clean-up
arxiv created 2017/05/29 · arxiv updated 2017/09/27
A number of very different approaches to quantum gravity contain a common thread, a hint that spacetime at very short distances becomes effectively two dimensional. I review this evidence, starting with a discussion of the physical meaning of "dimension" and concluding with some speculative ideas of what dimensional reduction might mean for physics.