Statistical Tests of Noise and Harmony in Dark Matter Modulation Signals
  The aim of the current work is a detailed time-series analysis of the data
from Dark Matter direct detection experiments as well as related datasets. We
examine recent claims that the cosmic ray muon flux can be responsible for
generating the modulation signals seen by DAMA and, more recently, by the
CoGeNT collaboration. We find no evidence for such a strong correlation and
show that the two phenomena differ in their power spectrum, phase, and possibly
in amplitude. In addition, we investigate in more detail, the time dependence
of Dark Matter scattering. Since the signal is periodic with period of a year
(due to the Earth's motion around the Sun), the presence of higher harmonics
can be expected. We show that the higher harmonics generically have similar
phase to the annual modulation and the biannual mode in particular could
provide another handle in searching for Dark Matter in the laboratory.
