There are currently two main approaches of combining general relativity and quantum mechanics: string theory and loop quantum gravity. Jim Baggott gives an overview of their key similarities and differences.
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Jim Baggott is a freelance science writer. He was a lecturer in chemistry at the University of Reading but left to work with Shell International Petroleum Company, and then as an independent business consultant and trainer. His many books include Mass (OUP, 2017), Origins (OUP, 2015), Higgs (OUP, 2012), The Quantum Story (OUP, 2011), and A Beginner's Guide to Reality (Penguin, 2005).
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