Spacetime foam: a review
General Relativity and Quantum Cosmology
2023-05-17 v3 High Energy Physics - Theory
Abstract
More than 65 years ago, John Wheeler suggested that quantum uncertainties of the metric would be of order one at the Planck scale, leading to large fluctuations in spacetime geometry and topology, which he termed "spacetime foam." In this review I discuss various attempts to implement this idea and to test it, both theoretically and, to a lesser extent, observationally.
Keywords
Cite
@article{arxiv.2209.14282,
title = {Spacetime foam: a review},
author = {S. Carlip},
journal= {arXiv preprint arXiv:2209.14282},
year = {2023}
}
Comments
42 pages (including 15 pages of referdences); v2: mainly more references, minor fixes; v3: corrected error on growth of triangulations, new discussion of higher order action, some other new references and clarifications