Time travelling in emergent spacetime
arXiv:1907.11167
Abstract
Most approaches to quantum gravity suggest that relativistic spacetime is not fundamental, but instead emerges from some non-spatiotemporal structure. This paper investigates the implications of this suggestion for the possibility of time travel in the sense of the existence of closed timelike curves in some relativistic spacetimes. In short, will quantum gravity reverse or strengthen general relativity's verdict that time travel is possible?
17 pages, 1 figure; written for Judit Madarasz and Gergely Szekely (eds.), Hajnal Andreka and Istvan Nemeti on the Unity of Science: From Computing to Relativity Theory Through Algebraic Logic, Springer