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The apparition of the first stars radically changed the state of the gas in the Univers.  With their highly energetic radiation, they heat up and ionize  the surrounding gas and ionise it. gas.  Moreover, at the end of his their  life, stars explode in supernovae, which create swirl in the gas around them. But this gas is also the main material use to grow the next generation of stars. And stars, and  a change in his state can could  havegreat  consequence on the future star formation rate of the futures  generations. To study of these intense period of change, induce induced  by a complex coupling into different physics, we need to use  numerical simulation are needed. simulations.