Quantum gravity -- an unfinished revolution
Claus Kiefer · arXiv (Cornell University) · 2023
It is generally assumed that the search for a consistent and testable theory of quantum gravity is among the most important open problems of fundamental physics. I review the motivations for this search, the main problems on the way, and the status of present approaches and their physical relevance. I speculate on what the situation could be in 2050.