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The (a)temporal emergence of spacetimeThis talk discusses tentative insights into the 'big bang', offered by quantum theories of gravity. The focus is the question of how the spacetime of general relativity might have evolved from a non-spatiotemporal state of the universe: or better, if the process is itself atemporal, how did it 'emerge'? We discuss three examples from the literature: Gasperini's string theoretic pre-big bang T-dual state that expands (without inflation) to the current spatiotemporal state; Bojowald's postulated existence in loop quantum gravity of a mirror universe behind the big bang; and Oriti's proposal of 'geometrogenesis' in group field theory.
University of Illinois at Chicago
University of Geneva