Euclid : Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data

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dc.contributor.author Euclid Collaboration
dc.contributor.author Martinelli, M.
dc.contributor.author Kurki-Suonio, H.
dc.date.accessioned 2021-11-24T12:30:08Z
dc.date.available 2021-11-24T12:30:08Z
dc.date.issued 2021-10-26
dc.identifier.citation Euclid Collaboration , Martinelli , M & Kurki-Suonio , H 2021 , ' Euclid : Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data ' , Astronomy & Astrophysics , vol. 654 , A148 . https://doi.org/10.1051/0004-6361/202141353
dc.identifier.other PURE: 170228833
dc.identifier.other PURE UUID: 9559db57-33aa-4e77-879f-96191909a97e
dc.identifier.other WOS: 000711136600001
dc.identifier.other ORCID: /0000-0002-4618-3063/work/103030661
dc.identifier.other Scopus: 85118455273
dc.identifier.uri http://hdl.handle.net/10138/336706
dc.description.abstract In physically realistic, scalar-field-based dynamical dark energy models (including, e.g., quintessence), one naturally expects the scalar field to couple to the rest of the model's degrees of freedom. In particular, a coupling to the electromagnetic sector leads to a time (redshift) dependence in the fine-structure constant and a violation of the weak equivalence principle. Here we extend the previous Euclid forecast constraints on dark energy models to this enlarged (but physically more realistic) parameter space, and forecast how well Euclid, together with high-resolution spectroscopic data and local experiments, can constrain these models. Our analysis combines simulated Euclid data products with astrophysical measurements of the fine-structure constant, alpha, and local experimental constraints, and it includes both parametric and non-parametric methods. For the astrophysical measurements of alpha, we consider both the currently available data and a simulated dataset representative of Extremely Large Telescope measurements that are expected to be available in the 2030s. Our parametric analysis shows that in the latter case, the inclusion of astrophysical and local data improves the Euclid dark energy figure of merit by between 8% and 26%, depending on the correct fiducial model, with the improvements being larger in the null case where the fiducial coupling to the electromagnetic sector is vanishing. These improvements would be smaller with the current astrophysical data. Moreover, we illustrate how a genetic algorithms based reconstruction provides a null test for the presence of the coupling. Our results highlight the importance of complementing surveys like Euclid with external data products, in order to accurately test the wider parameter spaces of physically motivated paradigms. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Astronomy & Astrophysics
dc.rights unspecified
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.subject 115 Astronomy, Space science
dc.title Euclid : Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1051/0004-6361/202141353
dc.relation.issn 0004-6361
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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