Informal Pizza Seminar

Codimension-two brane inflation

Hyun Min Lee

McMaster University

We consider a probe codimension-2 brane inflation scenario in a warped flux compactification of 6D gauged supergravity with codimension-2 brane sources. The volume modulus of the model is stabilized by means of dilaton potentials breaking the scale invariance on the regularized background branes. We discuss the cosmological evolution of the world-volume of a probe codimension-2 brane when it moves along the radial direction of the internal space. In order to have slow-roll inflation, one needs the warping of the internal space to be weak, in contrast to the recent string inflation constructions with strong warping. We discuss the parameter range that the inflation is in agreement with the observationally inferred parameters and which furthermore is consistent with the probe brane approximation. We argue with a multi-brane solution that the mild warping needed for a slow-roll inflation is not spoiled by the probe brane.