Microscopic Origin of Volume Modulus Inflation
  High-scale string inflationary models are in well-known tension with
low-energy supersymmetry. A promising solution involves models where the
inflaton is the volume of the extra dimensions so that the gravitino mass
relaxes from large values during inflation to smaller values today. We describe
a possible microscopic origin of the scalar potential of volume modulus
inflation by exploiting non-perturbative effects, string loop and higher
derivative perturbative corrections to the supergravity effective action
together with contributions from anti-branes and charged hidden matter fields.
We also analyse the relation between the size of the flux superpotential and
the position of the late-time minimum and the inflection point around which
inflation takes place. We perform a detailed study of the inflationary dynamics
for a single modulus and a two moduli case where we also analyse the
sensitivity of the cosmological observables on the choice of initial
conditions.
