In Eleanor Knox & Alastair Wilson (eds.), The Routledge Companion to Philosophy of Physics. Routledge (2021)

Authors
Christian Wüthrich
University of Geneva
Abstract
Although general relativity is a predictively successful theory, it treats matter as classical rather than as quantum. For this reason, it will have to be replaced by a more fundamental quantum theory of gravity. Attempts to formulate a quantum theory of gravity suggest that such a theory may have radical consequences for the nature, and indeed the fate, of spacetime. The present article articulates what this problem of spacetime is and traces it three approaches to quantum gravity taking general relativity as their vantage point: semi-classical gravity, causal set theory, and loop quantum gravity.
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Shedding Light on Time.Craig Callender - 2000 - Philosophy of Science 67 (3):599.
Decoupling Emergence and Reduction in Physics.Karen Crowther - 2015 - European Journal for Philosophy of Science 5 (3):419-445.

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