We study the effects of WIMP dark matter (DM) annihilations on the collapse
evolution of the first stars in the Universe.
First, we use a 1-D hydrodynamical code to study the final phases of the
collapse, exploring the parameter space in order to determine whether the
input from annihilations can modify the star formation process.
Then, we use a stellar evolution code to follow the pre-Main Sequence (MS)
phase of a
grid of metal-free stars, looking for the effects of the DM energy input on their
In our calculations we account for adiabatic contraction and scattering/capture
Such processes can enhance the central DM density so much that the
effectively counteract the gravitational collapse: in some instances the protostar
prevented from reaching the ZAMS, while in other cases the changes (e.g., a
of the MS life) are less dramatic.