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Quantum Gravity (Stanford Encyclopedia of Philosophy)

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Quantum Gravity, broadly construed, is a physical theory (still ‘under construction’ after over 100 years) incorporating both the principles of general relativity and quantum theory. Such a theory is expected to be able to provide a satisfactory description of the microstructure of spacetime at the so-called Planck scale, at which all fundamental constants of the ingredient theories, c 𝑐 (the velocity of light in vacuo), ℏ ℏ (the reduced Planck’s constant), and G (Newton’s constant), come together to form units of mass, length, and time. This scale is so remote from current experimental capabilities that the empirical testing of quantum gravity proposals along standard lines is rendered near-impossible, though there have been some recent developments that suggest the outlook might be more optimistic than previously surmised (see Carney, Stamp, and Taylor, 2022, for a review; Huggett, Linnemann, and Schneider, 2023, provides a pioneering philosophical examination of so-called “labo

--> Quantum Gravity (Stanford Encyclopedia of Philosophy) Stanford Encyclopedia of Philosophy Menu Browse Table of Contents What's New Random Entry Chronological Archives About Editorial Information About the SEP Editorial Board How to Cite the SEP Special Characters Advanced Tools Contact Support SEP Support the SEP PDFs for SEP Friends Make a Donation SEPIA for Libraries Entry Navigation Entry Contents Bibliography Academic Tools Friends PDF Preview Author and Citation Info Back to Top Quantum Gravity First published Mon Dec 26, 2005; substantive revision Mon Feb 26, 2024 Quantum Gravity, br

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