Direct detection of non-galactic light dark matter

Understand

A fraction of the dark matter in the solar neighborhood might be composed of non-galactic particles with speeds larger than the escape velocity of the Milky Way.

• The non-galactic dark matter flux would enhance the sensitivity of direct detection experiments, due to the larger momentum transfer to the target.
• In this note, we calculate the impact of the dark matter flux from the Local Group and the Virgo Supercluster diffuse components in nuclear and electron recoil experiments.
• The enhancement in the signal rate can be very significant, especially for experiments searching for dark matter induced electron recoils.