We consider the possibility that the
IceCube's 6-year high-energy starting events (HESE) data
may be better explained by a combination of neutrino fluxes
from dark matter decay and an isotropic astrophysical power-law
than purely by the latter. We find that the combined two-component
flux qualitatively improves the fit to the observed data over
a purely astrophysical one, and discuss how these updated fits
compare against a similar analysis done with the 4-year HESE data.
We also show fits involving dark matter decay via multiple channels,
without any contribution from the astrophysical flux. We find that
a DM-only explanation is not excluded by neutrino data alone.
Finally, we also consider the possibility of a signal from dark
matter annihilations and perform analogous analyses
to the case of decays, commenting on its implications.
|Secondary track (number)||08|