Canonical description of cosmological backreaction

Abstract

Canonical methods of quasiclassical dynamics make it possible to go beyond a strict background approximation for cosmological perturbations by including independent fields such as correlation degrees of freedom. New models are introduced and analyzed here for cosmological dynamics in the presence of quantum correlations between background and perturbations, as well as cross-correlations between different modes of a quantum field. Evolution equations for moments of a perturbation state reveal conditions required for inhomogeneity to build up out of an initial vacuum. A crucial role is played by quantum non-locality, formulated by canonical methods as an equivalent local theory with non-classical degrees of freedom given by moments of a quantum state.

arXiv comment33 pages, 11 figures, v2: new explanations and figure 11

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• Meso-inflationary Peccei-Quinn symmetry breaking with non-minimal coupling
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• Expanding and Self-Organizing 2D Universe Models Emerging from Frozen Trivalent Spin Networks
• Semiclassical study of the Mixmaster model: the quantum Kasner map
• Dynamics and entanglement in quantum and quantum-classical systems: lessons for gravity