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Revisiting a Negative Cosmological Constant from Low-Redshift Data
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Uppsala Univ, Dept Phys & Astron, Lagerhyddsvagen 1, SE-75120 Uppsala, Sweden.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0001-7958-8940
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Dept Phys, AlbaNova Univ Ctr, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden.;Univ Cambridge, Kavli Inst Cosmol KICC, Madingley Rd, Cambridge CB3 0HA, England.;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England..ORCID iD: 0000-0002-7614-6677
Uppsala Univ, Dept Phys & Astron, Lagerhyddsvagen 1, SE-75120 Uppsala, Sweden..
2019 (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
MDPI , 2019. Vol. 11, no 8, article id 1035
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-260202DOI: 10.3390/sym11081035ISI: 000483559300066Scopus ID: 2-s2.0-85070498087OAI: oai:DiVA.org:kth-260202DiVA, id: diva2:1355817
Note

QC 20190930

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-09-30Bibliographically approved

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