Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data

Understand

It has been proposed that during the formation of the first generation stars there might be a "dark star" phase in which the power of the star comes from dark matter annihilation.

• The adiabatic contraction process to form the dark star would result in a highly concentrated density profile of the host halo at the same time, which may give enhanced indirect detection signals of dark matter.
• In this work we investigate the extragalactic $\gamma$-ray background from dark matter annihilation with such a dark star formation scenario, and employ the isotropic $\gamma$-ray data from Fermi-LAT to constrain the model parameters of dark matter.
• The results suffer from large uncertainties of both the formation rate of the first generation stars and the subsequent evolution effects of the host halos of the dark stars.