The Universe from Scratch
R. Loll, J. Ambjorn, J. Jurkiewicz

TL;DR
This paper discusses the quest for a quantum theory of gravity, focusing on Causal Dynamical Triangulations as a promising approach to understanding spacetime's structure from quantum to cosmic scales.
Contribution
It introduces Causal Dynamical Triangulations and summarizes its progress in deriving spacetime structure from fundamental principles.
Findings
Spacetime can emerge from quantum fluctuations.
Causal Dynamical Triangulations reproduces large-scale spacetime geometry.
Progress towards a quantum gravity theory at the Planck scale.
Abstract
A fascinating and deep question about nature is what one would see if one could probe space and time at smaller and smaller distances. Already the 19th-century founders of modern geometry contemplated the possibility that a piece of empty space that looks completely smooth and structureless to the naked eye might have an intricate microstructure at a much smaller scale. Our vastly increased understanding of the physical world acquired during the 20th century has made this a certainty. The laws of quantum theory tell us that looking at spacetime at ever smaller scales requires ever larger energies, and, according to Einstein's theory of general relativity, this will alter spacetime itself: it will acquire structure in the form of "curvature". What we still lack is a definitive Theory of Quantum Gravity to give us a detailed and quantitative description of the highly curved and…
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