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• W2145322946 abstract "In a recent proposal using the group field theory approach, a spatially homogeneous (generally anisotropic) universe is described as a quantum gravity condensate of ``atoms of space,'' which allows the derivation of an effective cosmological Friedmann equation from the microscopic quantum gravity dynamics. Here we take a first step towards the study of cosmological perturbations over the homogeneous background. We consider a state in which a single ``atom'' is added to an otherwise homogeneous condensate. Backreaction of the perturbation on the background is negligible and the background dynamics can be solved separately. The dynamics for the perturbation takes the form of a quantum cosmology Hamiltonian for a ``wave function,'' depending on background and perturbations, of the product form usually assumed in a Born-Oppenheimer approximation. We show that the perturbation we consider corresponds to a spatially homogeneous metric perturbation, and for this case derive the usual procedures in quantum cosmology from fundamental quantum gravity." @default.
• W2145322946 created "2016-06-24" @default.
• W2145322946 creator A5082154254 @default.
• W2145322946 date "2015-02-20" @default.
• W2145322946 modified "2023-09-23" @default.
• W2145322946 title "Perturbing a quantum gravity condensate" @default.
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• W2145322946 doi "https://doi.org/10.1103/physrevd.91.043526" @default.
• W2145322946 hasPublicationYear "2015" @default.
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