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Damped perturbations in the no-boundary state

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arxiv 1804.01102 v2 pith:AH3ALLZM submitted 2018-04-03 gr-qc hep-th

Damped perturbations in the no-boundary state

Juan Diaz Dorronsoro , Jonathan J. Halliwell , James B. Hartle , Thomas Hertog , Oliver Janssen , Yannick Vreys This is my paper
classification gr-qc hep-th
keywords no-boundaryperturbationsscaledampedfactorproposalstateaccount
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We evaluate the no-boundary path integral exactly in a Bianchi IX minisuperspace with two scale factors. In this model the no-boundary proposal can be implemented by requiring one scale factor to be zero initially together with a judiciously chosen regularity condition on the momentum conjugate to the second scale factor. Taking into account the non-linear backreaction of the perturbations we recover the predictions of the original semiclassical no-boundary proposal. In particular we find that large perturbations are strongly damped, consistent with vacuum state wave functions.

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