Research Highlights: Dark Matter
We have produced the world-best limits on the spin-dependent cross section for weakly interacting dark matter particles. They are derived from the failure to observe the annihilation into neutrinos of dark matter particles gravitationally trapped by the Sun. IceCube can also perform indirect searches for dark matter by looking for the neutrino signature of dark matter annihilation in the galactic halo, galaxy clusters, and the center of the Earth.
The neutralino, the lightest weakly interacting massive particle (WIMP) in many supersymmetric models, is the usual test candidate in dark matter searches. The Sun provides the golden channel for searches of the annihilation of WIMPs since the expected signature is not subject to any astrophysical ambiguities. As seen in the graphic, IceCube has set limits on a combination of mass and cross section, i.e., for a given mass we exclude a cross section higher than a certain value. These are the most stringent upper limits yet for spin-dependent interactions of dark matter particles with ordinary matter.