Cosmology with next generation radio telescopes

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dc.contributor.advisorSantos, Mario
dc.contributor.advisorWeltman, Amanda
dc.contributor.advisorClarkson, Chris
dc.contributor.authorWitzemann, Amadeus
dc.date.accessioned2019-07-18T13:27:54Z
dc.date.accessioned2024-05-14T13:26:45Z
dc.date.available2019-07-18T13:27:54Z
dc.date.available2024-05-14T13:26:45Z
dc.date.issued2019
dc.descriptionPhilosophiae Doctor - PhDen_US
dc.description.abstractThe next generation of radio telescopes will revolutionize cosmology by providing large three-dimensional surveys of the universe. This work presents forecasts using the technique 21cm intensity mapping (IM) combined with results from the cosmic microwave background, or mock data of galaxy surveys. First, we discuss prospects of constraining curvature independently of the dark energy (DE) model, finding that the radio instrument HIRAX will reach percent-level accuracy even when an arbitrary DE equation of state is assumed. This is followed by a study of the potential of the multi-tracer technique to surpass the cosmic variance limit, a crucial method to probe primordial non-Gaussianity and large scale general relativistic e↵ects. Using full sky simulations for the Square Kilometre Array phase 1 (SKA 1 MID) and the Large Synoptic Survey Telescope (LSST), including foregrounds, we demonstrate that the cosmic variance contaminated scenario can be beaten even in the noise free case. Finally, we derive the signal to noise ratio for the cosmic magnification signal from foreground HI intensity maps combined with background galaxy count maps. Instruments like SKA1 MID and HIRAX are highly complementary and well suited for this measurement. Thanks to the powerful design of the planned radio instruments, all results confirm their potential and promise an exciting future for cosmology.en_US
dc.identifier.urihttps://hdl.handle.net/10566/15034
dc.language.isoenen_US
dc.publisherUniversity of the Western Capeen_US
dc.rights.holderUniversity of the Western Capeen_US
dc.subjectRadio telescopesen_US
dc.subjectAstronomyen_US
dc.subjectIntensity mappingen_US
dc.subjectGalaxiesen_US
dc.subjectSquare Kilometer Arrayen_US
dc.subjectLarge Synoptic Survey Telescope (LSST)en_US
dc.titleCosmology with next generation radio telescopesen_US

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Philosophiae Doctor - PhD (Physics)