Speaker
Description
We study the cosmology of a recent model of supersymmetry breaking,
in the presence of a tuneable positive cosmological constant, based on a
gauged shift symmetry of a string modulus that can be identified with
the string dilaton. The minimal spectrum of the ‘hidden’ supersymmetry
breaking sector consists then of a vector multiplet that gauges the shift
symmetry of the dilaton multiplet and when coupled to the MSSM leads
to a distinct low energy phenomenology depending on one parameter. Here
we study the question if this model can also lead to inflation by identifying
the dilaton with the inflaton. We find that this is possible if the Kahler
potential is modified by a term that has the form of NS5-brane instantons,
leading to an appropriate inflationary plateau around the maximum of
the scalar potential, depending on two extra parameters. This model is
consistent with present cosmological observations without modifying the
low energy particle phenomenology associated to the minimum of the scalar
potential.Talk based on hep-ph/1608.02121.
