01:13:25
published on March 13, 2026
Spurion Analysis for a Class of Selection Rules Without Group Actions
By Ling-Xiao Xu
Testing Stringy and Field Theory GUTs With Axions
By Mario Reig
Appears in collection : Symmetry and Topology in Partical Physics
The topological nature of axion couplings to gauge bosons offers unique opportunities to obtain information about the UV limit of the SM. The coupling to photons is particularly important experimentally. I will discuss why the discovery of an axion-like particle above the QCD line would rule out grand unified theories, the perturbative heterotic string, and F-theory GUTs. Based on 2206.07053, 2410.03820 and 2509.08042.
