Scientists are exploring a new method to map dark matter within the Milky Way by analyzing the relative motion between Earth and the dark matter halo. As the solar system moves through the galaxy at several hundred kilometers per second, Earth experiences a directional dark matter wind.
The proposed approach relies on detecting annual modulation, a periodic change in the flux and velocity of dark matter particles caused by Earth's orbit around the Sun. Researchers believe that measuring these directional signals could help reconstruct the spatial distribution of dark matter.
Current detection efforts face significant challenges, as the exact composition of dark matter remains unknown, with candidates including WIMPs and axions. Traditional detectors struggle to identify the direction of particle impacts, necessitating the development of more sensitive directional detectors.
By combining data from stellar and gas dynamics, gravitational lensing, and future particle detection experiments, scientists aim to create a detailed map of the dark matter halo. This research could help validate or exclude various theoretical models regarding dark matter particle properties.
