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2021 Fall KIAS HEP Seminar Series

Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity

by Prof. Natsumi Nagata (University of Tokyo)

1423 in building 1 (KIAS)

1423 in building 1



Title: Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity

Speaker: Prof. Natsumi Nagata (University of Tokyo)

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.

[Seminar] Natsumi Nagata
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