Abstract
It is known that hidden U(1) gauge factors can couple to visible U(1)s through kinetic mixing. This phenomenon is shown to occur in non-supersymmetric string set-ups, between D-branes and D̄-branes. Kinetic mixing, if present, acts either to give millicharges (of, e.g., hypercharge) to would-be hidden sector fermions, or to generate an enhanced communication of supersymmetry breaking that dominates over the usual gravitational suppression. In either case, the conclusion is that the string scale in non-supersymmetric brane configurations has a generic upper bound of M s ≲10 8 GeV.
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