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Fuzzy Euclidean wormholes in de Sitter space
Stockholm University, Faculty of Science, Department of Physics. National Taiwan University, Taiwan.
Number of Authors: 3
2017 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, 001Article in journal (Refereed) Published
Abstract [en]

We investigate Euclidean wormholes in Einstein gravity with a massless scalar field in de Sitter space. Euclidean wormholes are possible due to the analytic continuation of the time as well as complexification of fields, where we need to impose the classicality after the Wick-rotation to the Lorentzian signatures. For some parameters, wormholes are preferred than Hawking-Moss instantons, and hence wormholes can be more fundamental than Hawking-Moss type instantons. Euclidean wormholes can be interpreted in three ways: (1) classical big bounce, (2) either tunneling from a small to a large universe or a creation of a collapsing and an expanding universe from nothing, and (3) either a transition from a contracting to a bouncing phase or a creation of two expanding universes from nothing. These various interpretations shed some light on challenges of singularities. In addition, these will help to understand tensions between various kinds of quantum gravity theories.

Place, publisher, year, edition, pages
2017. no 7, 001
Keyword [en]
quantum cosmology, physics of the early universe, cosmic singularity
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-147175DOI: 10.1088/1475-7516/2017/07/001ISI: 000406420500016OAI: oai:DiVA.org:su-147175DiVA: diva2:1143362
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2017-11-29Bibliographically approved

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