PIRSA:26040107

Video URL

https://pirsa.org/26040107

The QCD Axion Mass in String Theory

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

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

          @misc{ scivideos_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 for Theoretical Physics},
            year = {2026},
            month = {apr},
            note = {PIRSA:26040107 see, \url{https://scivideos.org/pirsa/26040107}}
          }

Benjamin Safdi Massachusetts Institute of Technology (MIT)

Talk numberPIRSA:26040107
DOI10.48660/26040107
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

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.