PIRSA:26040107 Scientific Series Particle Physics

DOI10.48660/26040107

Series: Particle Physics

Safdi, B. (2026). The QCD Axion Mass in String Theory. Perimeter Institute. https://pirsa.org/26040107

Safdi, Benjamin. The QCD Axion Mass in String Theory. Perimeter Institute, Apr. 14, 2026, https://pirsa.org/26040107 

@misc{ pirsa_PIRSA:26040107,
  doi = {10.48660/26040107},
  url = {https://pirsa.org/26040107},
  author = {Safdi, Benjamin},
  keywords = {Particle Physics},
  language = {en},
  title = {The QCD Axion Mass in String Theory},
  publisher = {Perimeter Institute},
  year = {2026},
  month = {apr},
  note = {PIRSA:26040107 see, \url{https://pirsa.org}}
}

Abstract

Axions, grand unification, and string theory are each compelling extensions of the Standard Model. I will show that combining these frameworks imposes strong constraints on the QCD axion mass. Using unitarity arguments and explicit string compactifications - such as those from the Kreuzer-Skarke (KS) type IIB ensemble - I will discuss why the axion mass is favored to lie within the range 1e-11 eV < m_a < 1e-8 eV.

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