PPC 2023: XVI International Conference on Interactions between Particle Physics and Cosmology

Composite Dilaton Inflation

Not scheduled

20m

Conference room (2nd floor) (IBS)

Parallel: Cosmology 1

Speaker

Dhong Yeon Cheong (Yonsei University)

Description

This work investigates the possibility that our inflation originates from a composite theory. Taking an $SU(N_c)$ gauge theory with $N_f$ fermions in the fundamental representation, we consider an effective chiral Lagrangian involving a dilaton and pions. The walking dynamics of the theory constrain the potential specifics. We identify the dilaton as the inflaton, which resembles a hybrid inflation with the pions acting as a waterfall field in the potential. Analyzing the inflationary dynamics, we find a parameter region supporting small-field inflation compatible with Planck 2018 inflationary observables. We further discuss possible phenomenological consequences of this theory.