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We analyse the phenomenology of orbifold scenarios from the heteroticsuperstring, and the resulting theoretical predictions for the direct detectionof neutralino dark matter. In particular, we study the parameter space of theseconstructions, computing the low-energy spectrum and taking into account themost recent experimental and astrophysical constraints, as well as imposing theabsence of dangerous charge and colour breaking minima. In the remainingallowed regions the spin-independent part of the neutralino-proton crosssection is calculated and compared with the sensitivity of dark matterdetectors. In addition to the usual non universalities of the soft terms inorbifold scenarios due to the modular weight dependence, we also considerD-term contributions to scalar masses. These are generated by the presence ofan anomalous U(1), providing more flexibility in the resulting soft terms, andare crucial in order to avoid charge and colour breaking minima. Thanks to theD-term contribution, large neutralino detection cross sections can be found,within the reach of projected dark matter detectors.

Prospects for the direct detection of neutralino dark matter in orbifold scenarios