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Abstract: Axions and axion-like particles may arise in Nature as a spectrum rather than as a single field. Such a scenario naturally emerges in string-inspired constructions, as well as in reasonably simple bottom-up extensions of single axion models. In such multi-axion scenarios, existing experimental bounds often need to be reinterpreted, and the translation from single-axion constraints is generally non-trivial. This motivates a closer look at how axion searches are impacted when multiple states contribute.
In this talk, I will first briefly introduce bulk axions in extra dimensions as a concrete framework that naturally generates multiple modes, and highlight some of the phenomenological subtleties that follow. I will then present general results for multi-axions–photon oscillations, showing how coherence and interference can either enhance or suppress signals, with direct implications for light-shining-through-a-wall experiments and beyond.
Speaker:Arturo Di Georgi
currently Post Doctoral Research Associate at Durham Univeristy (IPPP) in UK, working in the neutrino group on BSM.. His work broadly centres on the phenomenology of particle physics beyond the Standard Model, with recent efforts emphasising extra-dimensional scenarios, massive spin‑2 dynamics across collider, astrophysical, and cosmological scales, and their interplay with axions and neutrinos. In 2025 was awarded for his significant contributions to theoretical and phenomenological aspects of physics beyond the Standard Model, particularly on new low-mass particles and extra-dimensions." Prize: Theoretical Physics Prize "Giuliano Preparata".
Tecent Meeting ID：585464660 Password：852771