IIB String Theory and Sequestered Inflation
  We develop sequestered inflation models, where inflation occurs along flat
directions in supergravity models derived from type IIB string theory. It is
compactified on a ${\mathbb{T}^6 \over \mathbb{Z}_2 \times \mathbb{Z}_2}$
orientifold with generalized fluxes and O3/O7-planes. At Step I, we use flux
potentials which 1) satisfy tadpole cancellation conditions and 2) have
supersymmetric Minkowski vacua with flat direction(s). The 7 moduli are split
into heavy and massless Goldstone multiplets. At Step II we add a nilpotent
multiplet and uplift the flat direction(s) of the type IIB string theory to
phenomenological inflationary plateau potentials: $\alpha$-attractors with 7
discrete values $3\alpha = 1, 2, 3, ..., 7$. Their cosmological predictions are
determined by the hyperbolic geometry inherited from string theory. The masses
of the heavy fields and the volume of the extra dimensions change during
inflation, but this does not affect the inflationary dynamics.
