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  No smooth beginning for spacetime

Feldbrugge, J., Lehners, J.-L., & Turok, N. (2017). No smooth beginning for spacetime. Physical Review Letters, 119: 171301. doi:10.1103/PhysRevLett.119.171301.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-5A42-F Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EA17-D
Genre: Journal Article

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1705.00192.pdf (Preprint), 516KB
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 Creators:
Feldbrugge, Job, Author
Lehners, Jean-Luc1, Author              
Turok, Neil, Author
Affiliations:
1String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              

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Free keywords: High Energy Physics - Theory, hep-th,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We identify a fundamental obstruction to any theory of the beginning of the universe as a semi-classical quantum process, describable using complex, smooth solutions of the classical Einstein equations. The no boundary and tunneling proposals are examples of such theories. We argue that the Lorentzian path integral for quantum cosmology is meaningful and, with the use of Picard-Lefschetz theory, provides a consistent definition of the semi-classical expansion. Framed in this way, the no boundary and tunneling proposals become identified, and the resulting framework is unique. Unfortunately, the Picard-Lefschetz approach shows that the primordial fluctuations are out of control: larger fluctuations receive a higher quantum mechanical weighting. We prove a general theorem to this effect, in a wide class of theories. A semi-classical description of the beginning of the universe as a regular tunneling event thus appears to be untenable.

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 Dates: 2017-04-292017
 Publication Status: Published in print
 Pages: 2 figures, 1 included in latex file
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1705.00192
URI: http://arxiv.org/abs/1705.00192
DOI: 10.1103/PhysRevLett.119.171301
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 119 Sequence Number: 171301 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1