Neutrino and Axion Astronomy with Dark Matter Experiments
  Sensitive dark matter (DM) experiments can be well exploited beyond their
designated targets, allowing to explore a breadth of physics topics. As we
discuss, future large direct DM detection experiments constitute impressive
telescopes, complementary to conventional neutrino detectors. This opens a new
window into neutrino astronomy, including puzzles such as the origin of
supermassive black holes and topics like supernova forecast. Furthermore, DM
experiments can act as effective instruments for multimessenger astronomy. This
is well illustrated by exploration of relativistic axions from transient
astrophysical sources (e.g. axion star explosions), providing novel signatures
as well as possible insights into the axion potential.
