Three Roads to Quantum Gravity

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Three Roads to Quantum Gravity is a 2001 book by theoretical physicist Lee Smolin. He discusses three potential approaches by which a unified theory of quantum gravity, arguably the foremost issue in theoretical physics, may be realized. Approaches discussed include string theory, M-theory, and Smolin's preferred approach, loop quantum gravity. Smolin insinuates that these approaches may be approximations of a single, underlying theory.

[edit] See also

• Quantum mechanics
• The Trouble With Physics
• The Road to Reality
• The Elegant Universe
• The Fabric of the Cosmos
• Warped Passages