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The early Universe is a precious probe of the birth of primordial objects,first star formation events and consequent production of photons and heavyelements. Higher-order corrections to the cosmological linear perturbationtheory predicts the formation of coherent supersonic gaseous streaming motionsat decoupling time. These bulk flows impact the gas cooling process anddetermine a cascade effect on the whole baryon evolution. By analyticalestimates and N-body hydrodynamical chemistry numerical simulations includingatomic and molecular evolution, gas cooling, star formation, feedback effectsand metal spreading for individual species from different stellar populationsaccording to the proper yields and lifetimes, we discuss the role of theseprimordial bulk flows at the end of the dark ages and their detectable impactsduring the first Gyr in view of the upcoming SKA mission. Early bulk flows caninhibit molecular gas cooling capabilities, suppressing star formation, metalspreading and the abundance of small primordial galaxies in the infantUniverse. This can determine a delay in the re-ionization process and in theheating of neutral hydrogen making the observable HI signal during cosmicevolution patchier and noisier. The planned SKA mission will represent a majoradvance over existing instruments, since it will be able to probe the effectson HI 21cm at z ~ 6-20 and on molecular line emissions from first collapsingsites at z ~ 20-40. Therefore, it will be optimal to address the effects ofprimordial streaming motions on early baryon evolution and to give constraintson structure formation in the first Gyr.

Bulk Flows and End of the Dark Ages with the SKA