Chi-Ting Chiang, Marc Kamionkowski, Gordan Z. Krnjaic
We consider the prospects to use polarized dark-matter detectors to
discriminate between various dark-matter models. If WIMPs are Dirac particles,
with a particle-antiparticle asymmetry, and if those particles have
neutrino-like parity-violating interactions with ordinary matter, then the
recoil-direction and recoil-energy distributions of nuclei in detectors will
depend on the orientation of the initial nuclear spin with respect to the
velocity of the detector through the Galactic halo. If, however, WIMPS are
scalars, Majorana fermions, or are matter-antimatter symmetric, no such signal
can arise. Since the amplitude of this polarization modulation is fixed by the
detector speed through the halo, in units of the speed of light, exposures
several times larger than those of current experiments will be required to be
probe this effect.
View original:
http://arxiv.org/abs/1202.1807
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