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Near-future facilities observing the high-redshift universe ($2<z<5$) willhave an opportunity to take advantage of "multi-tracer" cosmology by observingmultiple tracers of the matter density field: Lyman alpha emitters (LAE), Lymanbreak galaxies (LBG), and CMB lensing $\kappa$. In this work we use Fisherforecasts to investigate the effect of multi-tracers on next-generationfacilities. In agreement with previous work, we show that multiple tracersimprove constraints primarily from degeneracy breaking, instead of thetraditional intuition of sample variance cancellation. Then, we forecast thatfor both BBN and CMB primary priors, the addition of lensing and LAEs onto aLBG-only sample will gain 25\% or more in many parameters, with the largestgains being factor of $\sim10$ improvement for $f_{\rm EDE}$. We include apreliminary approach towards modelling the impact of radiative transfer (RT) onforecasts involving LAEs by introducing a simplified model at linear theorylevel. Our results, albeit preliminary, show that the while RT influencesLAE-only forecasts strongly, its effect on composite multi-tracer forecasts arelimited.

Cosmology before noon with multiple galaxy populations