Detection Prospects for Majorana Fermion WIMPless Dark Matter

Understand

We consider both velocity-dependent and velocity-independent contributions to spin-dependent (SD) and spin-independent (SI) nuclear scattering (including one-loop corrections) of WIMPless dark matter, in the case where the dark matter candidate is a Majorana fermion.

• We find that spin-independent scattering arises only from the mixing of exotic squarks, or from velocity-dependent terms.
• Nevertheless (and contrary to the case of MSSM neutralino WIMPs), we find a class of models which cannot be detected through SI scattering, but can be detected at IceCube/DeepCore through SD scattering.
• We study the detection prospects for both SI and SD detection strategies for a large range of Majorana fermion WIMPless model parameters.