Speaker
Aitor Landete
(IFT, UAM-CSIC)
Description
We develop new scenarios of large field inflation in type IIA string compactifications in which the key ingredient is a D6-brane that generates a bilinear superpotential which couples the brane position modulus to a Kahler modulus, this allows us to construct two different models where the inflaton candidate could be the B-field axion or the D6-brane Wilson Line. The scalar potential has the multi-branched structure typical of F-term axion monodromy models and, near its supersymmetric minima, it is described by a 4d supergravity model of chaotic inflation with a stabiliser field.
We analyse both cases in the context of type IIA moduli stabilisation, finding an effective potential for the inflaton system and a simple mechanism to lower the inflaton mass with respect to closed string moduli stabilised by fluxes.
Finally, we analyze the B-field potential for trans-Planckian field values by means of the DBI action. The effect of Planck suppressed corrections is a flattened potential which, in terms of the compactification parameters, interpolates between linear and quadratic inflation. This renders the cosmological parameters of these models compatible with current experimental bounds, with the tensor-to-scalar ratio ranging as 0.08 < r < 0.12
Primary author
Aitor Landete
(IFT, UAM-CSIC)
