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Revisiting a Negative Cosmological Constant from Low-Redshift Data
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Uppsala University, Sweden.ORCID iD: 0000-0001-7958-8940
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Cambridge, UK.ORCID iD: 0000-0002-7614-6677
Number of Authors: 32019 (English)In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 8, article id 1035Article in journal (Refereed) Published
Abstract [en]

Persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the Universe might be more complex than the positive cosmological constant of the ?CDM model. Motivated by string theory, wherein symmetry considerations make consistent AdS backgrounds (i.e., maximally-symmetric spacetimes with a negative cosmological constant) ubiquitous, we explore a scenario where the dark energy sector consists of two components: a negative cosmological constant, with a dark energy component with equation of state w phi on top. We test the consistency of the model against low-redshift baryon acoustic oscillation and Type Ia supernovae distance measurements, assessing two alternative choices of distance anchors: the sound horizon at baryon drag determined by the Planck collaboration and the Hubble constant determined by the SH0ES program. We find no evidence for a negative cosmological constant and mild indications for an effective phantom dark energy component on top. A model comparison analysis reveals that the ?CDM model is favoured over our negative cosmological constant model. While our results are inconclusive, should low-redshift tensions persist with future data, it would be worth reconsidering and further refining our toy negative cosmological constant model by considering realistic string constructions.

Place, publisher, year, edition, pages
2019. Vol. 11, no 8, article id 1035
Keywords [en]
negative cosmological constant, H-0 tension, dark energy, low-redshift data, extended cosmological models
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-175126DOI: 10.3390/sym11081035ISI: 000483559300066OAI: oai:DiVA.org:su-175126DiVA, id: diva2:1360864
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved

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Visinelli, LucaVagnozzi, Sunny
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