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118996 |
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|a Shandera, Sarah
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|a Massachusetts Institute of Technology. Research Laboratory of Electronics
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|a Kamal, Archana
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|a Agarwal, Nishant
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|a Kamal, Archana
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|a Open quantum cosmological system
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|b American Physical Society,
|c 2018-11-14T14:42:39Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/118996
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|a We derive the evolution equation for the density matrix of a UV- and IR- limited band of comoving momentum modes of the canonically normalized scalar degree of freedom in two examples of nearly de Sitter universes. Including the effects of a cubic interaction term from the gravitational action and tracing out a set of longer wavelength modes, we find that the evolution of the system is non-Hamiltonian and non-Markovian. We find linear dissipation terms for a few modes with wavelength near the boundary between system and bath, and nonlinear dissipation terms for all modes. The non-Hamiltonian terms in the evolution equation persist to late times when the scalar field dynamics is such that the curvature perturbation continues to evolve on super-Hubble scales.
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|a Article
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|t Physical Review D
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