New dark matter candidates motivated from superstring derived unification
arXiv:hep-ph/9603272 · doi:10.1016/S0370-2693(97)00140-8
Abstract
Perturbative gauge coupling unification in realistic superstring models suggests the existence of additional heavy down-type quarks, beyond the minimal supersymmetric standard model. The mass scale of the heavy down-type quarks is constrained by requiring agreement between the measured low energy gauge parameters and the string-scale gauge coupling unification. These additional quarks arise and may be stable due to the gauge symmetry breaking by ``Wilson lines'' in the superstring models. We argue that there is a window in the parameter space within which this down-type quark is a good candidate for the dark matter.
11 pages. Standard Latex. Final version to be published in Physics Letters B. Minor changes
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