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Two years after Witten’s proposal of M-theory, the Argentinian-American physicist Juan Maldacena found yet another surprising relationship, this time between strings and point particles. Maldacena’s work suggested that under certain conditions, a theory that includes gravity, be it string theory or otherwise, can be directly translated into a quantum field theory that does not have gravity. In the theory’s simplest manifestation, the “certain conditions” require an imaginary landscape known as anti-de Sitter (AdS) space, which resembles graph paper viewed through a fisheye lens, with the squares getting smaller and smaller toward the boundary. A theory that describes how gravity works in an AdS space can be translated into an equivalent “conformal field theory” (CFT) representing point particles on that universe’s boundary. This connection enables researchers to study quantum gravity by probing the corresponding CFT. For example, they can play around with CFTs to calculate properties of quantum gravity theories in “AdS3” space — a fisheye universe with two spatial dimensions plus time. “The goal of finding quantum gravity in AdS3 could be translated into finding the right conformal field theory,” said Rangamani.” from In Fake Universes, Evidence for String Theory

quantum_gravity/concepts/ads_cft.txt · Last modified: 2017/12/06 09:33 (external edit)