Direct detection of non-galactic light dark matter

TL;DR

This paper investigates how non-galactic dark matter particles from the Local Group and Virgo Supercluster could significantly boost detection signals in direct detection experiments, especially for electron recoil searches.

Contribution

It introduces a calculation of the impact of non-galactic dark matter flux on direct detection experiments, highlighting potential signal enhancements.

Findings

Significant increase in detection signal due to non-galactic dark matter flux.

Enhanced sensitivity particularly in electron recoil experiments.

Potential for new detection strategies considering non-galactic components.

Abstract

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.