evidence for dark-matter in (exceedingly large) colliders

Today Ana Bonaca (Harvard) showed beautifully that the features seen in the GD-1 stellar stream are very well described by an encounter in the past (collision, if you will) with a dark-matter substructure. Her argument is fundamentally qualitative, but so many aspects of the data are matched by the toy model she has made that it is hard to see how to get around the conclusion. This could be huge! We discussed the scope of the paper she could write (or really the content of the abstract).

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