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Seminar
FIELD Phys:Particle Physics
DATE December 14 (Tue), 2021
TIME 16:00-17:30
PLACE Online
SPEAKER Natsumi Nagata
HOST Park, Jae-hyeon
INSTITUTE University of Tokyo
TITLE Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity
ABSTRACT It is known that gravitational instantons, or Euclidean wormholes, induce the Peccei-Quinn symmetry breaking effects, spoiling the Peccei-Quinn solution to the strong CP problem. In this talk, I will first review this argument based on some old studies. I will then discuss that this U(1)-breaking effect can sufficiently be suppressed if the Peccei-Quinn field has a non-minimal coupling to gravity. The required size of the non-minimal coupling can be compatible with that needed for successful inflation, where the Peccei-Quinn scalar field plays the role of inflaton.

https://indico.kias.re.kr/event/77
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