Isospin-Violating Dark Matter
Abstract
Searches for dark matter scattering off nuclei are typically compared assuming that the dark matter's spin-independent couplings are identical for protons and neutrons. This assumption is neither innocuous nor well motivated. We consider isospin-violating dark matter (IVDM) with one extra parameter, the ratio of neutron to proton couplings, and include the isotope distribution for each detector. For a single choice of the coupling ratio, the DAMA and CoGeNT signals are consistent with each other and with current XENON constraints, and they unambiguously predict near future signals at XENON and CRESST. We provide a quark-level realization of IVDM as WIMPless dark matter that is consistent with all collider and low-energy bounds.
Cite
@article{arxiv.1102.4331,
title = {Isospin-Violating Dark Matter},
author = {Jonathan L. Feng and Jason Kumar and Danny Marfatia and David Sanford},
journal= {arXiv preprint arXiv:1102.4331},
year = {2011}
}
Comments
5 pages; v2: added references and fixed figures for Mac users; v3: published version; v4: fixed erroneous Ar values in table I