TITLE: Star formation in the early universe:

AUTHOR: Naoki Yoshida (University of Tokyo)

ABSTRACT: We present the results from recent ultra-high resolution simulations of star-formation in the early universe. Our previous simulations followed all the relevant chemistry and radiative processes in a primordial gas cloud. We show a complete picure of how a primordial proto-star is formed from tiny density fluctuations left over from the Big Bang. We then show new simulations of star formation in a low-metallicity gas. The three-dimensional simulations follow the relevant processes such as fine-structure cooling and dust thermal emission in a direct manner, rather than assuming an equation-of-state. The criterion for low-mass star formation and the transition of IMF will be discussed.