Currently there is a discrepancy between the Standard Model prediction for the anomalous magnetic moment of the muon and the experimental value above 4 standard deviations according to the Muon g-2 Theory Initiative White Paper.
With further experimental improvements expected in the near future, it is imperative to further sharpen the theoretical prediction which is limited by uncertainties of QCD contributions. I describe the recent progress made in using gauge/gravity duality ("holographic QCD") to study hadronic contributions to the anomalous magnetic moment of the muon, in particular the hadronic light-by-light scattering contribution,
where the short-distance constraints associated with the axial anomaly are notoriously difficult to satisfy in hadronic models but are implemented naturally in simple ("bottom-up") holographic QCD models.
Anton Rebhan (TU Wien): Gauge/gravity duality and the anomalous magnetic moment of the muon
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