Dark matter detection with polarized detectors
We consider the prospects to use polarized dark-matter detectors to discriminate between various dark-matter models. If WIMPs are fermions and participate in 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, the only possible polarization-dependent interactions are extremely velocity-suppressed and, therefore, unobservable. 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.
© 2012 Elsevier. Open access under CC BY-NC-ND license. Available online 9 November 2012. GK thanks Fabrizio Caola, David E. Kaplan, and Kirill Melnikov for helpful discussions. GK is supported by the National Science Foundation under Grant number 106420. MK is supported by DoEDE-FG03-92-ER40701 and NASANNX10AD04G. This research was supported in part by Perimeter Institute for Theoretical Physics, which is is supported by the Government of Canada through Industry Canada and by the Province of Ontario.
Submitted - 1202.1807