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Smolin
Lee Smolin (6 June 1955 - ) is a leading figure in the field of loop quantum gravity, one of the two main approaches to the unification of quantum theory and gravity (the other being superstring theory, which also unifies the standard model of particle physics with gravity).
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He and Carlo Rovelli were the first to find a class of exact solutions to the Wheeler-DeWitt equation, and to define area and volume quantum operators with purely discrete spectra. This approach has a natural interpretation in terms of spin networks and spin foams, as invented by Penrose among others.
According to Smolin, it principal virtues are the thoroughgoing rejection of a fixed background spacetime, in contrast to superstring theory, and implements many of Leibniz’s and Mach's philosophical arguments in favour of relationalism.
Smolin was also greatly influenced by Julian Barbour's construction of genuinely Machian theories of gravity.
Smolin has made a number of cosmological proposals. In 19