  The DUNE/LBNF program aims to address key questions in neutrino physics and
astroparticle physics. Realizing DUNE's potential to reconstruct low-energy
particles in the 10-100 MeV energy range will bring significant benefits for
all DUNE's science goals. In neutrino physics, low-energy sensitivity will
improve neutrino energy reconstruction in the GeV range relevant for the
kinematics of DUNE's long-baseline oscillation program. In astroparticle
physics, low-energy capabilities will make DUNE's far detectors the world's
best apparatus for studying the electron-neutrino flux from a supernova. This
will open a new window to unrivaled studies of the dynamics and neutronization
of a star's central core in real time, the potential discovery of the neutrino
mass hierarchy, provide new sensitivity to physics beyond the Standard Model,
and evidence of neutrino quantum-coherence effects. The same capabilities will
also provide new sensitivity to `boosted dark matter' models that are not
observable in traditional direct dark matter detectors.
