Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: Gammaastronomie 1
T 89.1: Vortrag
Montag, 27. Februar 2012, 16:45–17:00, ZHG 008
Dark Star evolution with "Dark Stars" — •Franziska Laatz, Martin Raue, Andreas Maurer, and Dieter Horns — Universitaet Hamburg
It is predicted that the first stars in the history of the universe (PopIII stars) formed inside mini halos of 105 to 106 solar masses, which also contain a reasonable amount of dark matter. It has been proposed that self-annihilating dark matter (WIMPs) could provide an additional source of energy, producing a new type of stable object, a dark matter powered star (Dark Star).The properties of such a Dark Star may be altered in comparison to a normal Pop III star. Dark Stars are predicted to be cooler, larger, eventually more massive and potentially longer lived, due to their additional energy source. There have been several approaches to calculate the properties and evolution of such Dark Stars.
Recently many interesting results from direct detection experiments have suggested low WIMP masses (< 100 GeV). Considering results from Dama, CRESST and Xenon we calculate the evolution of stars, influenced by WIMP annihilation, for a range of ambient halo densities (the WIMPs get into the star via scattering) using the dark star evolution code "Dark Stars" from Scott et al. Based on the results it is possible to put some constraints on possible WIMP properties and the possible masses of Dark Stars.