Have we lost spacetime on the way? Narrowing the gap between general relativity and quantum gravity |
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Institution: | 1. Munich Center for Mathematical Philosophy, Ludwigstraße 31, Ludwig-Maximilians-Universität, 80539, München, Germany;2. Black Hole Initiative, 20 Garden St., Harvard University, Cambridge, MA, 02138, USA;1. Department of Physics, University of California, Santa Barbara, CA 93106, USA;2. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030, USA |
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Abstract: | Important features of space and time are taken to be missing in quantum gravity, allegedly requiring an explanation of the emergence of spacetime from non-spatio-temporal theories. In this paper, we argue that the explanatory gap between general relativity and non-spatio-temporal quantum gravity theories might significantly be reduced with two moves. First, we point out that spacetime is already partially missing in the context of general relativity when understood from a dynamical perspective. Second, we argue that most approaches to quantum gravity already start with an in-built distinction between structures to which the asymmetry between space and time can be traced back. |
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