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Consistency of tachyacoustic cosmology with de Sitter swampland conjectures
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University at Buffalo, U.S.A..
Number of Authors: 22019 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 10, article id 038Article in journal (Refereed) Published
Abstract [en]

Recent studies show that there is tension between the de Sitter swampland conjectures proposed by Obeid, et al. and inflationary cosmology. In this paper, we consider an alternative to inflation, tachyacoustic cosmology, in light of swampland conjectures. In tachyacoustic models, primordial perturbations are generated by a period of superluminal sound speed instead of accelerating expansion. We show that realizations of tachyacoustic Lagrangians can be consistent with the de Sitter swampland conjectures, and therefore can in principle be consistent with a UV-complete theory. We derive a general condition for models with c(S) > 1 to be consistent with swampland conjectures.

Place, publisher, year, edition, pages
2019. no 10, article id 038
Keywords [en]
alternatives to inflation, quantum gravity phenomenology, string theory and cosmology, initial conditions and eternal universe
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-177560DOI: 10.1088/1475-7516/2019/10/038ISI: 000503491500006OAI: oai:DiVA.org:su-177560DiVA, id: diva2:1383009
Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07Bibliographically approved

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Lin, Wei-ChenKinney, William H.
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