HeH+ Reaction Rate in Early Universe Challenges Previous Theories

Researchers at the Max Planck Institute for Nuclear Physics have recreated the reaction of HeH+ with deuterium under early universe conditions using the Cryogenic Storage Ring (CSR). Contrary to previous predictions, the reaction rate remains nearly constant at low temperatures, implying a much greater role for HeH+ and H2 in the formation of the first stars than previously thought. This finding revises our understanding of early universe chemistry and significantly advances our knowledge of early star formation.