Axions in Japan

Session

Parallel session - Theory II

13 Nov 2025, 14:00

Lecture Hall (Kavli IPMU)

Conveners

Parallel session - Theory II

• Chair: Jianing Wang

31. Aspects of non-minimal couplings

Anamaria Hell

13/11/2025, 14:00

Non-minimal couplings between vector fields, 3-forms, and scalars have emerged as intriguing candidates for dark matter and dark energy. At the same time, their theoretical study reveals unexpected features, including subtle issues with dynamics and consistency. In this talk, I will review recent developments in the study of non-minimal couplings, highlighting both their potential roles and...

32. Reheating after Axion Inflation and its implications (CANCELLED)

Tenta Tsuji

13/11/2025, 14:20

In modern cosmology, it is generally assumed that after inflation, the energy of the inflaton field is transferred to radiation through a process known as reheating.
Axion-like particles (ALPs) have recently attracted attention as potential inflaton candidates, since their shift symmetry naturally protects the flatness of the inflaton potential.

In this work, we study reheating in a model...

33. Examining Mass Enhancement in a High-Quality Composite Axion Model

Takafumi Aoki

13/11/2025, 14:40

The Peccei–Quinn (PQ) mechanism is a prominent solution to the strong CP problem. However, it faces the axion quality problem: higher-dimensional, Planck-suppressed operators which explicitly break PQ symmetry can reintroduce the effective QCD theta angle. In composite axion models, where strong dynamics at high energies dynamically break PQ symmetry, certain constructions address this quality...