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In the pursuit of understanding the large-scale structure of the Universe,the synergy between complementary cosmological surveys has proven to be apowerful tool. Using multiple tracers of the large-scale structure cansignificantly improve the constraints on cosmological parameters. We explorethe potential of combining the Square Kilometre Array Observatory (SKAO) andthe Dark Energy Spectroscopic Instrument (DESI) spectroscopic surveys toenhance precision on the growth rate of cosmic structures. We employ amultitracer Fisher analysis to estimate precision on the growth rate when usingpairs of mock surveys that are based on SKAO and DESI specifications. The pairsare at both low and high redshifts. For SKA-MID, we use the HI galaxy and theHI intensity mapping samples. In order to avoid the complexities anduncertainties at small scales, we confine the analysis to scales where linearperturbations are reliable. The consequent loss of signal in each individualsurvey is mitigated by the gains from the multi-tracer. After marginalisingover cosmological and nuisance parameters, we find a significant improvement inthe precision on the growth rate.

Constraining the growth rate on linear scales by combining SKAO and DESI surveys