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- W2889204008 abstract "While the equations of general relativity take the same form in any coordinate system, choosing a suitable set of coordinates is essential in any practical application. This poses a challenge in background-independent quantum gravity, where coordinates are not a priori available and need to be reconstructed from physical degrees of freedom. We review the general idea of coupling free scalar fields to gravity and using these scalars as a reference frame. The resulting coordinate system is harmonic, i.e. it satisfies harmonic (de Donder) gauge. We then show how to introduce such matter reference frames in the group field theory approach to quantum gravity, where spacetime is emergent from a condensate of fundamental quantum degrees of freedom of geometry, and how to use matter coordinates to extract physics. We review recent results in homogeneous and inhomogeneous cosmology, and give a new application to the case of spherical symmetry. We find tentative evidence that spherically symmetric group field theory condensates defined in this setting can reproduce the near-horizon geometry of a Schwarzschild black hole." @default.
- W2889204008 created "2018-09-07" @default.
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- W2889204008 date "2018-08-30" @default.
- W2889204008 modified "2023-09-27" @default.
- W2889204008 title "Quantum gravity and quantum cosmology in a matter reference frame" @default.
- W2889204008 hasPublicationYear "2018" @default.
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