https://doi.org/10.1140/epjc/s10052-019-7046-3
Regular Article - Theoretical Physics
Automatic Peccei–Quinn symmetry
1
Departamento de Física Teórica and Instituto de Física Teórica, IFT-UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
2
Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, 277-8582, Japan
3
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba, 277-8583, Japan
4
T. D. Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
* e-mail: pablo.quilez@uam.es
Received:
8
January
2019
Accepted:
12
June
2019
Published online:
25
June
2019
We present a dynamical (composite) axion model where the Peccei–Quinn (PQ) symmetry arises automatically as a consequence of chirality and gauge symmetry. The Standard Model is simply extended by a confining and chiral SU(5) gauge symmetry. The PQ symmetry coincides with a 
symmetry of the exotic sector. The theory is protected by construction from quantum gravitational corrections stemming from operators with mass dimension lower than nine.
© The Author(s), 2019
