Dark Matter Capture and Annihilation over the First Stars: Preliminary Estimates

Assuming that Dark Matter is dominated by WIMPs, it accretes by gravitational attraction and scattering over baryonic material and annihilates inside celestial objects, giving rise to a “Dark Luminosity” which may potentially affect the evolution of stars. In this short letter we estimate the Dark Luminosity achieved by different kinds of stars in a halo with DM properties characteristic of the ones were the first star formation episode occurs. We find that either massive, metal-poor(/free) and small, galactic-like stars can achieve Dark Luminosities comparable or exceeding their nuclear ones. This, together with the peculiar values of the DM distribution inside the objects, and the transport effects induced by WIMP scattering off baryons, might have dramatic effects over the evolution of the very first stars, known as Population III. Subject headings: Population III — early Universe — stars: evolution — dark matter