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Choi, Kiwoon
순수물리이론 연구단
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Recent Progress in the Physics of Axions and Axion-Like Particles

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Title
Recent Progress in the Physics of Axions and Axion-Like Particles
Author(s)
Kiwoon Choi; Sang Hui Im; Chang Sub Shin
Publication Date
2021-09
Journal
Annual Review of Nuclear and Particle Science, v.71, pp.225 - 252
Publisher
Annual Reviews, Inc.
Abstract
The axion is a light pseudoscalar particle postulated to solve issues with the Standard Model, including the strong CP problem and the origin of dark matter. In recent years, there has been remarkable progress in the physics of axions in several directions. An unusual type of axion-like particle termed the relaxion was proposed as a new solution to the weak scale hierarchy problem. There are also new ideas for laboratory, astrophysical, or cosmological searches for axions; such searches can probe a wide range of model parameters that were previously inaccessible. On the formal theory side, the weak gravity conjecture indicates a tension between quantum gravity and a trans-Planckian axion field excursion. Many of these developments involve axions with hierarchical couplings. In this article, we review recent progress in axion physics, with particular attention paid to hierarchies between axion couplings. We emphasize that the parameter regions of hierarchical axion couplings are the most accessible experimentally. Moreover, such regions are often where important theoretical questions in the field are addressed, and they can result from simple model-building mechanisms.
URI
https://pr.ibs.re.kr/handle/8788114/10911
DOI
10.1146/annurev-nucl-120720-031147
ISSN
0163-8998
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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