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arXiv:2302.13047gr-qc

Quantum gravity -- an unfinished revolution

Claus Kiefer

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Abstract

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.

arXiv comments
24 pages, 6 figures, invited contribution to EPS Grand Challenges: Physics for Society at the Horizon 2050
Journal reference
DOI
Subjects
gr-qcGeneral Relativity and Quantum Cosmology hep-thHigh Energy Physics, Theory physics.hist-phHistory and Philosophy of Physics

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