Abstract
We use the separate universe framework to study cosmological perturbations within the group field theory formalism for quantum gravity, based on multicondensate quantum states. Working with a group field theory action for gravity minimally coupled to four scalar fields that can act as a set of relational clock and rods, we argue that these multicondensate states correspond to cosmological space-times with small long-wavelength scalar perturbations. Equations of motion for the cosmological perturbations are derived, which in the classical limit agree with the standard results of general relativity and also include quantum gravity corrections that become important when the space-time curvature approaches the Planck scale.
- Received 21 May 2018
DOI:https://doi.org/10.1103/PhysRevD.98.066011
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