King, Stephan F. and Roberts, Jonathan P.
Natural dark matter from type I string theory.
Journal of High Energy Physics, 01, (024), . (doi:10.1088/1126-6708/2007/01/024).
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We study neutralino dark matter within a semi-realistic type I string model, where supersymmetry breaking arises from F-terms of moduli fields parameterised in terms of Goldstino angles, which automatically gives rise to non-universal soft third sfamily and gaugino masses. We study the fine-tuning sensitivities for dark matter and electroweak symmetry breaking across the parameter space of the type I string model, and compare the results to a similar analysis in the non-universal MSSM. Within the type I string model we find that neutralino dark matter can be naturally implemented in the bulk region, the Z0 resonance region and the maximally tempered Bino/Wino/Higgsino region, in agreement with the results of the non-universal MSSM analysis. We also find that in the type I string model the ``well-tempered'' Bino/Wino region is less fine-tuned than in the MSSM, whereas the co-annihilation region exhibits a significantly higher degree of fine-tuning than in the MSSM.
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