Gravitational focusing effects on streaming dark matter as a new detection concept

Cosmological simulations of dark matter (DM) indicate the presence of many fine-grained streams at the location of the solar system. The fine-grained streams have small velocity dispersion which could be beneficial for strong gravitational effects (GF). Solar and planetary GF is effective for the slow DM particles, with possible strong flux enhancements produced for streams of axions and WIMPs. In this work we add the combined GF by the Sun and the Earth, before a stream reaches the detectors. Spatiotemporal transient density enhancements are computed, which are of interest for certain DM experiments. Due to the built-in gravitational flux enhancements, advantages are expected when compared to the detection schemes designed for the smooth Standard Halo Model. The present simulation focuses on fine-grained streams but it can be applied to any configuration of DM propagating inside the solar system.