Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps

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dc.contributor.authorKaragiannis, Dionysios
dc.contributor.authorMaartens, Roy
dc.contributor.authorRandrianjanahary, Liantsoa F.
dc.date.accessioned2023-03-17T13:03:46Z
dc.date.available2023-03-17T13:03:46Z
dc.date.issued2022
dc.description.abstractThe 21cm emission of neutral hydrogen is a potential probe of the matter distribution in the Universe after reionisation. Cosmological surveys of this line intensity will be conducted in the coming years by the SKAO and HIRAX experiments, complementary to upcoming galaxy surveys. We present the first forecasts of the cosmological constraints from the combination of the 21cm power spectrum and bispectrum. Fisher forecasts are computed for the constraining power of these surveys on cosmological parameters, the BAO distance functions and the growth function. We also estimate the constraining power on dynamical dark energy and modified gravity. Finally we investigate the constraints on the 21cm clustering bias, up to second order. We take into account the effects on the 21cm correlators of the telescope beam, instrumental noise and foreground avoidance, as well as the Alcock-Paczynski effect and the effects of theoretical errors in the modelling of the correlators.en_US
dc.identifier.citationKaragiannis, D. et al. (2022). Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps. Journal of Cosmology and Astroparticle Physics, 003. 10.1088/1475-7516/2022/11/003en_US
dc.identifier.issn1475-7516
dc.identifier.uri10.1088/1475-7516/2022/11/003
dc.identifier.urihttp://hdl.handle.net/10566/8619
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.subjectAstronomyen_US
dc.subjectPhysicsen_US
dc.subjectCosmologyen_US
dc.subjectPower spectrumen_US
dc.subjectAstrophysicsen_US
dc.titleCosmological constraints from the power spectrum and bispectrum of 21cm intensity mapsen_US
dc.typeArticleen_US

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