Accidental/Hilltop Inflation from Kähler Uplifting
by
Shenglin Jing(CITA, Toronto)
→
Europe/Berlin
semiar room 2, building 2A (DESY Hamburg)
semiar room 2, building 2A
DESY Hamburg
Description
One way of seeking for a viable model of inflation of the very early universe is to construct as simple a model as possible that is consistent with observations. While we hold the view that the observed features of the CMB originate from the low-energy limit of something more fundamental. We analyze the possibility of realizing inflation with a subsequent dS vacuum in the K\"ahler uplifting scenario in Type IIB string theory. The inclusion of several quantum corrections to the 4d effective action evades previous no-go theorems and allows for construction of simple and successful models of string inflation. The predictions of all benchmark models are in accord with PLANCK, while being in tension with BICEP2. A particularly interesting subclass of models are "left-rolling" ones, where the overall volume of the compactified dimensions shrinks during inflation. We call this phenomenon "inflation by deflation" (IBD), where deflation refers to the internal manifold. This subclass has the appealing features, comparing to those of the accidental models, of being insensitive to initial conditions, avoiding the overshooting problem, and allowing for observable running ? ~ 0.012 and enhanced tensor-to-scalar ratio r ~ 10?5. The latter results differ significantly from many string inflation models.
