The Empirical Case For 10 GeV Dark Matter
  In this article, I summarize and discuss the body of evidence which has
accumulated in favor of dark matter in the form of approximately 10 GeV
particles. This evidence includes the spectrum and angular distribution of
gamma rays from the Galactic Center, the synchrotron emission from the Milky
Way's radio filaments, the diffuse synchrotron emission from the Inner Galaxy
(the "WMAP Haze") and low-energy signals from the direct detection experiments
DAMA/LIBRA, CoGeNT and CRESST-II. This collection of observations can be
explained by a relatively light dark matter particle with an annihilation cross
section consistent with that predicted for a simple thermal relic (sigma v ~
10^-26 cm^3/s) and with a distribution in the halo of the Milky Way consistent
with that predicted from simulations. Astrophysical explanations for the gamma
ray and synchrotron signals, in contrast, have not been successful in
accommodating these observations. Similarly, the phase of the annual modulation
observed by DAMA/LIBRA (and now supported by CoGeNT) is inconsistent with all
known or postulated modulating backgrounds, but are in good agreement with
expectations for dark matter scattering. This scenario is consistent with all
existing indirect and collider constraints, as well as the constraints placed
by CDMS. Consistency with xenon-based experiments can be achieved if the
response of liquid xenon to very low-energy nuclear recoils is somewhat
suppressed relative to previous evaluations, or if the dark matter possesses
different couplings to protons and neutrons.
