Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys

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dc.contributor.authorSheean, Jolicoeur
dc.contributor.authorMaartens, Roy
dc.contributor.authorJolicoeur, Sheean
dc.contributor.authorDlamini, Simthembile
dc.date.accessioned2023-05-09T07:51:35Z
dc.date.available2023-05-09T07:51:35Z
dc.date.issued2023
dc.description.abstractSurveys of the matter distribution contain ‘fossil’ information on possible non-Gaussianity that is generated in the primordial universe. This primordial signal survives only on the largest scales where cosmic variance is strongest. By combining different surveys in a multi-tracer approach, we can suppress the cosmic variance and significantly improve the precision on the level of primordial non-Gaussianity.We consider a combination of an optical galaxy survey, like the recently initiated DESI survey, together with a new and very different type of survey, a 21cm intensity mapping survey, like the upcoming SKAO survey. A Fisher forecast of the precision on the local primordial non-Gaussianity parameter fNL, shows that this multi-tracer combination, together with non-overlap single-tracer information, can deliver precision comparable to that from the CMB. Taking account of the largest systematic, i.e. foreground contamination in intensity mapping, we find that σ( fNL) ∼ 4en_US
dc.identifier.citationJolicoeur, S., Maartens, R., & Dlamini, S. (2023). Constraining primordial non-gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys. European Physical Journal C, 83(4) doi:10.1140/epjc/s10052-023-11482-2en_US
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-023-11482-2
dc.identifier.urihttp://hdl.handle.net/10566/8906
dc.language.isoenen_US
dc.publisherInstitute for Ionicsen_US
dc.subjectCosmic varianceen_US
dc.subjectPrimordial Universeen_US
dc.subjectOptical galaxy surveyen_US
dc.subjectPrimordial non-Gaussianity parameteren_US
dc.titleConstraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveysen_US
dc.typeArticleen_US

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