Dark Matter Disc Enhanced Neutrino Fluxes from the Sun and Earth
  As disc galaxies form in a hierarchical cosmology, massive merging satellites
are preferentially dragged towards the disc plane. The material accreted from
these satellites forms a dark matter disc that contributes 0.25 - 1.5 times the
non-rotating halo density at the solar position. Here, we show the importance
of the dark disc for indirect dark matter detection in neutrino telescopes.
Previous predictions of the neutrino flux from WIMP annihilation in the Earth
and the Sun have assumed that Galactic dark matter is spherically distributed
with a Gaussian velocity distribution, the standard halo model. Although the
dark disc has a local density comparable to the dark halo, its higher phase
space density at low velocities greatly enhances capture rates in the Sun and
Earth. For typical dark disc properties, the resulting muon flux from the Earth
is increased by three orders of magnitude over the SHM, while for the Sun the
increase is an order of magnitude. This significantly increases the sensitivity
of neutrino telescopes to fix or constrain parameters in WIMP models. The flux
from the Earth is extremely sensitive to the detailed properties of the dark
disc, while the flux from the Sun is more robust. The enhancement of the muon
flux from the dark disc puts the search for WIMP annihilation in the Earth on
the same level as the Sun for WIMP masses < 100 GeV.
