# Charge and Color Breaking and D-terms in String Theory

@article{Ibarra2001ChargeAC, title={Charge and Color Breaking and D-terms in String Theory}, author={Alejandro Ibarra}, journal={Journal of High Energy Physics}, year={2001}, volume={2002}, pages={003-003} }

In four dimensional superstring models, the gauge group normally contains extra U(1)s that are broken at a high energy scale. We show that the presence of the extra U(1)s is crucial for the phenomenological viability of string scenarios, since the contribution to the scalar masses from the D-terms can lift the unbounded from below directions that usually appear when the gauge group at high energies is just the Standard Model group. In particular, we show that the dilaton dominated scenario can…

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Submitted on 19 May 2008 (v1), last revised 26 Jun 2008 (this version, v2).-- 60 pages, 7 figures, 2 tables. References added.

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