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`A story of de- and re-coupling: supersymmetry breaking in string models'

Abstract: I will describe recent efforts to understand the mediation of
supersymmetry breaking in stabilised compactifications of type IIB string
theory. Flavour problems are a typical side-effect in models with
gravity-mediated supersymmetry breaking – and string models are no exception
to this. First I will review in what circumstances extradimensional locality
can lead to acceptable soft supersymmetry breaking terms. However, moduli
stabilisation introduces an obstruction to this: non-perturbative effects can
induce cross-couplings between the visible sector and the Kaehler moduli and
thus spoil sequestering. Type IIB orbifold backgrounds represent calculable
toy models to examine these non-perturbative superpotential terms. In these
setups I will study the conditions under which these problematic operators
appear and discuss their importance for KKLT and LVS constructions. 
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