Testing The Light Dark Matter Hypothesis With AMS
  The spectrum and morphology of gamma-rays from the Galactic Center and the
spectrum of synchrotron emission observed from the Milky Way's radio filaments
have each been interpreted as possible signals of $\sim$7-10 GeV dark matter
particles annihilating in the Inner Galaxy. In dark matter models capable of
producing these signals, the annihilations should also generate significant
fluxes of $\sim$7-10 GeV positrons which can lead to a distinctive bump-like
feature in local cosmic ray positron spectrum. In this letter, we show that
while such a feature would be difficult to detect with PAMELA, it would likely
be identifiable by the currently operating AMS experiment. As no known
astrophysical sources or mechanisms are likely to produce such a sharp feature,
the observation of a positron bump at around 7-10 GeV would significantly
strengthen the case for a dark matter interpretation of the reported gamma-ray
and radio anomalies.
