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  Quantum approach to a Bianchi I singularity

Alonso-Serrano, A., Bojowald, M., & Brizuela, D. (2020). Quantum approach to a Bianchi I singularity. Physical Review D: Particles, Fields, Gravitation, and Cosmology, 101(10): 104062. doi:10.1103/PhysRevD.101.104062.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A593-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-883F-B
Genre: Journal Article

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 Creators:
Alonso-Serrano, Ana1, Author              
Bojowald, Martin, Author
Brizuela, David, Author
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Theory, hep-th
 Abstract: The approach of a quantum state to a cosmological singularity is studied through the evolution of its moments in a simple version of a Bianchi I model. In spite of the simplicity, the model exhibits several instructive and unexpected features of the moments. They are investigated here both analytically and numerically in an approximation in which anisotropy is assumed to vary slowly, while numerical methods are also used to analyze the case of a rapidly evolving anisotropy. Physical conclusions are drawn mainly regarding two questions. First, quantum uncertainty of anisotropies does not necessarily eliminate the existence of isotropic solutions, with potential implications for the interpretation of minisuperspace truncations as well as structure-formation scenarios in the early universe. Secondly, back-reaction of moments on basic expectation values is found to delay the approach to the classical singularity.

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 Dates: 2020-01-302020
 Publication Status: Published in print
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 Identifiers: arXiv: 2001.11488
URI: http://arxiv.org/abs/2001.11488
DOI: 10.1103/PhysRevD.101.104062
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Title: Physical Review D: Particles, Fields, Gravitation, and Cosmology
Source Genre: Journal
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Pages: - Volume / Issue: 101 (10) Sequence Number: 104062 Start / End Page: - Identifier: -