The Sterile-Active Neutrino Flavor Model: the Imprint of Dark Matter on
  the Electron Neutrino Spectra
  Contact interactions between sterile neutrinos and dark matter particles in a
hidden sector have been suggested as a good solution to simultaneously resolve
the dark matter problem and anomalies in neutrino experiments. In this
non-standard particle physics model, sterile and active neutrinos change their
through vacuum oscillations and matter (or Mikheyev--Smirnov--Wolfenstein)
oscillations, in which the latter mechanism of flavor oscillation depends
strongly on the concentration of dark matter in the Sun's core. We found that a
large concentration of dark matter in the Sun's interior changes substantially
the shape of ${\rm ^8B}$ and $\rm hep$ electron neutrino spectra, but has an
insignificant impact on the other neutrino spectra (i.e., $\rm pp$, $\rm pep$,
$\rm ^7Be$ and $\rm ^{15}O$, $\rm ^{13}N$ and $\rm ^{17}F$). The strength of
the interaction of the dark matter particles with neutrinos depends on an
effective coupling constant, $G_\chi$, which is an analog of the Fermi constant
for the hidden sector. By using the latest $\rm ^8B$ solar neutrino flux, we
found that $G_\chi$ must be smaller than $\rm 0.5\times 10^9$ $G_{\rm F}$ for
this particle physics model to be in agreement with the data.
