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De Sitter cosmology on an expanding bubble
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.ORCID iD: 0000-0001-7018-5133
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.ORCID iD: 0000-0003-0422-7010
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2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, article id 164Article in journal (Refereed) Published
Abstract [en]

Constructing an explicit compactification yielding a metastable de Sitter (dS) vacuum in a UV consistent string theory is an incredibly difficult open problem. Motivated by this issue, as well as the conjecture that all non-supersymmetric AdS vacua must decay, we discuss the alternative possibility of realizing an effective four-dimensional dS cosmology on a codimension-one bubble wall separating two AdS(5) vacua. The construction further elaborates on the scenario of , where the aforementioned cosmology arises due to a non-perturbative decay and is embedded in a five-dimensional bulk in a time- dependent way. In this paper we discuss the relation between this scenario and the weak gravity conjecture and further develop the details of the four-dimensional cosmology. We provide a bulk interpretation for the dS temperature as the Unruh temperature experienced by an accelerated observer riding the bubble. A source of four-dimensional matter arises from a string cloud in the bulk, and we examine the consequences for the particle mass spectrum. Furthermore, we show how effective four-dimensional Einstein gravity on the bubble is obtained from the five-dimensional Gauss equation. We conclude by outlining some implications that this paradigm will have for holography, inflation, the standard model, and black holes.

Place, publisher, year, edition, pages
Springer, 2019. no 10, article id 164
Keywords [en]
Phenomenology of Large extra dimensions, Strings and branes phenomenology
National Category
Subatomic Physics Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-399095DOI: 10.1007/JHEP10(2019)164ISI: 000491469600001OAI: oai:DiVA.org:uu-399095DiVA, id: diva2:1379040
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 113410212Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2019-12-16Bibliographically approved

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Banerjee, SouvikDanielsson, UlfDibitetto, GiuseppeGiri, SuvenduSchillo, Marjorie
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