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Watching the Universe’s acceleration era with the SKAO

C. M. J. Marques, C. J. A. P. Martins, B. Gilabert López

The possibility of watching the Universe expand in real time and in a model-independent way, first envisaged by Allan Sandage more than 60 yr ago and known as the redshift drift, is within reach of forthcoming astrophysical facilities, particularly the Extremely Large Telescope (ELT) and the Square Kilometre Array Observatory (SKAO). The latter, probing lower redshifts, enables us to watch the Universe’s acceleration era in real time, while the former does the same for the matter era. We use Fisher matrix analysis techniques, which we show to give comparable results to those of a Markov Chain Monte Carlo approach, to discuss forecasts for SKAO measurements of the redshift drift and their cosmological impact. We consider specific fiducial cosmological models but mainly rely on a more agnostic cosmographic series (which includes the deceleration and jerk parameters), and we also discuss prospects for measurements of the drift of the drift. Overall, our analysis shows that SKAO measurements, with a reasonable amount of observing time, can provide a competitive probe of the low-redshift accelerating Universe.

methods: analytical, methods: statistical, cosmological parameters, dark energy, cosmology: observations

Monthly Notices of the Royal Astronomical Society
Volume 527, Issue 4, Page 11
2024 February

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia