Testing distance duality with CMB anisotropies

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dc.contributor.author Räsänen, Syksy
dc.contributor.author Väliviita, Jussi-Pekka
dc.contributor.author Kosonen, Ville Severi
dc.date.accessioned 2020-01-22T13:31:01Z
dc.date.available 2020-01-22T13:31:01Z
dc.date.issued 2016
dc.identifier.citation Räsänen , S , Väliviita , J-P & Kosonen , V S 2016 , ' Testing distance duality with CMB anisotropies ' , Journal of Cosmology and Astroparticle Physics , vol. 2016 , no. 04 , 50 . https://doi.org/10.1088/1475-7516/2016/04/050
dc.identifier.other PURE: 77152086
dc.identifier.other PURE UUID: 57f73e0d-ac2f-4b90-98fc-c29e3a2be08b
dc.identifier.other WOS: 000393286400049
dc.identifier.other Scopus: 85012875777
dc.identifier.other ORCID: /0000-0003-2296-302X/work/30030535
dc.identifier.other ORCID: /0000-0001-6225-3693/work/30030716
dc.identifier.uri http://hdl.handle.net/10138/310149
dc.description.abstract We constrain deviations of the form T proportional to (1 + z)(1+epsilon) from the standard redshift-temperature relation, corresponding to modifying distance duality as D-L = (1 + z)(2(1+epsilon)) D-A. We consider a consistent model, in which both the background and perturbation equations are changed. For this purpose, we introduce a species of dark radiation particles to which photon energy density is transferred, and assume epsilon >= 0. The Planck 2015 release high multipole temperature plus low multipole data give the limit epsilon <4.5 x 10(-3) at 95% C.L. The main obstacle to improving this CMB-only result is strong degeneracy between and the physical matter densities omega(b) and omega(c). A constraint on deuterium abundance improves the limit to epsilon <1.8 x 10(-3). Adding the Planck high-multipole CMB polarisation and BAO data leads to a small improvement; with this maximal dataset we obtain epsilon <1.3 x 10(-3). This dataset constrains the present dark radiation energy density to at most 12% of the total photon plus dark radiation density. Finally, we discuss the degeneracy between dark radiation and the effective number of relativistic species N-eff, and consider the impact of dark radiation perturbations and allowing epsilon <0 on the results. en
dc.format.extent 24
dc.language.iso eng
dc.relation.ispartof Journal of Cosmology and Astroparticle Physics
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.subject 115 Astronomy, Space science
dc.title Testing distance duality with CMB anisotropies 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/10.1088/1475-7516/2016/04/050
dc.relation.issn 1475-7516
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion
dc.identifier.url https://arxiv.org/abs/1512.05346

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