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The presence of ultra-high energy cosmic rays in the universe in thepre-ionization epoch enhances significantly H$_2$ kinetics in virialized halos.It results in more efficient radiative cooling and decreases the lower masslimit of the first star-forming systems. Consequently, the fraction of baryonscontained in the first luminous objects and their contribution to thereionization of the universe can significantly increase in comparison with thestandard scenario.Comment: 5 pages, 3 figures, accepted in A&

Primordial star formation triggered by UV photons from UHECR