Speaker
Davide Dal Cin
(Sissa)
Description
The radial direction of the Peccei–Quinn field can drive cosmic inflation, given
a non-minimal coupling to gravity. This scenario has been considered to simultaneously
explain inflation, the strong CP problem, and dark matter. We argue that Peccei–Quinn
inflation is extremely sensitive to higher-dimensional operators. Further combining with the
discussion on the axion quality required for solving the strong CP problem, we examine
the validity of this scenario. We also show that after Peccei–Quinn inflation, resonant
amplifications of the field fluctuation is inevitably triggered.
