Creating Spacetime

          @misc{ scivideos_PIRSA:11070060,
            doi = {10.48660/11070060},
            url = {https://pirsa.org/11070060},
            author = {},
            keywords = {},
            language = {en},
            title = {Creating Spacetime},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2011},
            month = {jul},
            note = {PIRSA:11070060 see, \url{https://scivideos.org/pirsa/11070060}}
          }
          

Abstract

Our understanding of the physical world at the most fundamental level is based on two theories: quantum theory and general relativity. They are impressively successful but only when each is considered on its own. In situations where both play a role, we are reduced to puzzles and absurdity. Hence the search for a quantum theory of gravity, the currently missing theory that will work sensibly in exactly these situations. To the great frustration of researchers in this field, candidate quantum theories of gravity tend to produce more puzzles instead of answers. We shall take a tour of some of the problems, focusing on the role of spacetime and causality. We will consider the possibility that spacetime did not always exist but is instead emergent and explore how one can create a spacetime from a world with no notion of "here" and "there".