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Swampland constraints on no-boundary quantum cosmology

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Title
Swampland constraints on no-boundary quantum cosmology
Author(s)
Hiroki Matsui; Takahiro Terada
Subject
Models of Quantum Gravity, ; Solitons Monopoles and Instantons, ; Spacetime Singularities
Publication Date
2020-10
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2020, no.10, pp.162
Publisher
SPRINGER
Abstract
© 2020, The Author(s).The Hartle-Hawking no-boundary proposal describes the quantum creation of the universe. To have a non-negligible probability to obtain a classical expanding universe, eternal inflation is required, which is severely constrained by Swampland conjectures such as the refined de Sitter conjecture and the distance conjecture. We discuss this issue in detail and demonstrate the incompatibility. We show that the dimensionless parameters in the refined de Sitter conjecture should be bounded from above by a positive power of the scalar potential to realize the classical expanding universe. In other words, the probability of the classical expanding universe is extremely small under the Swampland conjectures unless the parameters are much smaller than unity. If they are order unity, on the other hand, the saddle-point solution itself ceases to exist implying a genuinely quantum universe
URI
https://pr.ibs.re.kr/handle/8788114/7585
DOI
10.1007/JHEP10(2020)162
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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