The Bronstein hypercube of quantum gravity

Abstract

We argue for enlarging the traditional view of quantum gravity, based on "quantizing GR", to include explicitly the non-spatiotemporal nature of the fundamental building blocks suggested by several modern quantum gravity approaches (and some semi-classical arguments), and to focus more on the issue of the emergence of continuum spacetime and geometry from their collective dynamics. We also discuss some recent developments in quantum gravity research, aiming at realising these ideas, in the context of group field theory, random tensor models, simplicial quantum gravity, loop quantum gravity, spin foam models.

27 pages, 2 figures; invited contribution to: Huggett, N., Matsubara, K. & Wuethrich, C. (Eds.) (2019). Beyond Spacetime : The Foundations of Quantum Gravity (provisional title). Cambridge: Cambridge University Press; v2: added sources of figures; v3: expanded discussion of a few points, added references, corrected typos

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