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  The Wavefunction of Anisotropic Inflationary Universes With No-Boundary Conditions

Bramberger, S. F., Farnsworth, S., & Lehners, J.-L. (2017). The Wavefunction of Anisotropic Inflationary Universes With No-Boundary Conditions. Physical Review D, 95: 083513. doi:10.1103/PhysRevD.95.083513.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A9B0-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-3049-6
Genre: Journal Article

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 Creators:
Bramberger, Sebastian F., Author
Farnsworth, Shane, Author
Lehners, Jean-Luc1, 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 study the emergence of anisotropic (Bianchi IX) inflationary universes with no-boundary conditions in the path integral approach to quantum gravity. In contrast to previous work, we find no evidence for any limit to how large the anisotropies can become, although for increasing anisotropies the shape of the instantons becomes significantly different from Hawking's original no-boundary instanton. In all cases an inflationary phase is reached, with the anisotropies decaying away. Larger anisotropies are associated with a much larger imaginary part of the action, implying that the highly anisotropic branches of the wavefunction are heavily suppressed. Interestingly, the presence of anisotropies causes the wavefunction to become classical much more slowly than for isotropic inflationary universes. We derive the associated scaling of the WKB classicality conditions both numerically and analytically.

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 Dates: 2017-01-202017
 Publication Status: Published in print
 Pages: 25 pages, 11 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1701.05753
URI: http://arxiv.org/abs/1701.05753
DOI: 10.1103/PhysRevD.95.083513
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 95 Sequence Number: 083513 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258