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Decoherence in quantum cosmology at the onset of inflation
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We calculate the reduced density matrix for the inflaton field in a model of chaotic inflation by tracing out degrees of freedom corresponding to various bosonic fields. We find a qualitatively new contribution to the density matrix given by the Euclidean effective action of quantum fields. We regularise the ultraviolet divergences in the decoherence factor. Dimensional regularisation is shown to violate the consistency conditions for a density matrix as a bounded operator. A physically motivated conformal redefinition of the environmental fields leads to well-defined expressions. They show that due to bosonic fields the Universe acquires classical properties near the onset of inflation.
Forward citations
Cited by 2 Pith papers
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Tensor Catalyzed Decoherence of Primordial Scalar Fluctuations
In single-field inflation, gravitational interactions mixing short-wavelength tensor and scalar modes decohere long-wavelength scalar perturbations at a rate proportional to (H/M_p)^2, with no suppression by the slow-...
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On the Quantum-to-Classical Transition of Primordial Perturbations
A dissertation that introduces slow-roll inflation and perturbations, critiques squeezing and decoherence formalisms, and investigates the pilot-wave approach to the quantum-to-classical transition with numerical illu...
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