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In recent years it has been learned that scalar superpartner masses andtrilinear couplings should both generically be larger than about 20 TeV at theshort distance string scale if our world is described by a compactified stringor M-theory with supersymmetry breaking and stabilized moduli. Here we studyimplications of this, somewhat generally and also in detail for a particularrealization (compactification of M-theory on a G_2 manifold) where there issignificant knowledge of the superpotential and gauge kinetic function, and alight gluino. In a certain sense this yields an ultraviolet completion ofminimal flavour violation. Flavour violation stems from off-diagonal andnon-universal diagonal elements of scalar mass matrices and trilinearcouplings, and from renormalization group running. We also examine stabilitybounds on the scalar potential. While heavy scalars alone do not guarantee theabsence of flavour problems, our studies show that models with heavy scalarsand light gluinos can be free from such problems.

Flavour issues for string-motivated heavy scalar spectra with a low gluino mass: the G2-MSSM case