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What is the no-boundary wave function of the Universe?

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Title: What is the no-boundary wave function of the Universe?
Authors: Halliwell, JJ
Hartle, JB
Hertog, T
Item Type: Journal Article
Abstract: We specify the semiclassical no-boundary wave function of the Universe without relying on a functional integral of any kind. The wave function is given as a sum of specific saddle points of the dynamical theory that satisfy conditions of regularity on the geometry and field and that together yield a time-neutral state that is normalizable in an appropriate inner product. This specifies a predictive framework of semiclassical quantum cosmology that is adequate to make probabilistic predictions, which are in agreement with observations in simple models. The use of holography to go beyond the semiclassical approximation is briefly discussed.
Issue Date: 15-Feb-2019
Date of Acceptance: 1-Feb-2019
URI: http://hdl.handle.net/10044/1/68155
DOI: https://doi.org/10.1103/PhysRevD.99.043526
ISSN: 2470-0010
Publisher: American Physical Society
Journal / Book Title: Physical Review D
Volume: 99
Issue: 4
Copyright Statement: © 2019 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
STEEPEST-DESCENT CONTOURS
PATH-INTEGRAL APPROACH
QUANTUM COSMOLOGY
STATE
Publication Status: Published
Open Access location: https://doi.org/10.1103/PhysRevD.99.043526
Article Number: 043526
Online Publication Date: 2019-02-19
Appears in Collections:Physics
Theoretical Physics