The Sun as a sub-GeV Dark Matter Accelerator

Preprint number: CP3-Origins-2017-35 DNRF90
Authors: Timon Emken (CP3-Origins), Chris Kouvaris (CP3-Origins), and Niklas Grønlund Nielsen (CP3-Origins)
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Sub-GeV halo dark matter that enters the Sun can potentially scatter off hot solar nuclei and be ejected with a much larger velocity than the incoming one. We derive an expression for the rate and velocity distribution of these reflected particles taking into account the Sun’s temperature and opacity and we investigate the prospects of detecting this population. We demonstrate that future detectors could use these energetic reflected particles to probe light dark matter in parameter space that the ordinary halo population cannot access.