Primordial Black Hole Dark Matter evaporating on the Neutrino Floor
  Primordial black holes (PBHs) hypothetically generated in the first instants
of life of the Universe are potential dark matter (DM) candidates. Focusing on
PBHs masses in the range $[5 \times10^{14} - 5 \times 10^{15}]$g, we point out
that the neutrinos emitted by PBHs evaporation can interact through the
coherent elastic neutrino nucleus scattering (CE$\nu$NS) producing an
observable signal in multi-ton DM direct detection experiments. We show that
with the high exposures envisaged for the next-generation facilities, it will
be possible to set bounds on the fraction of DM composed by PBHs improving the
existing neutrino limits obtained with Super-Kamiokande. We also quantify to
what extent a signal originating from a small fraction of DM in the form of
PBHs would modify the so-called "neutrino floor", the well-known barrier
towards detection of weakly interacting massive particles (WIMPs) as the
dominant DM component.
