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Speaker: Ben Safdi, Associate Professor of Physics, UC Berkeley Host: Elias Most, Assistant Professor of Theoretical Astrophysics, Caltech Axions are some of the best-motivated beyond the Standard Model particle candidates at present. These ultralight particles may account for the cosmological dark matter and explain other outstanding problems in nature, such as the strong-CP problem; they also are now known to emerge generically in string theory. Axions are expected to couple ultra-weakly with ordinary matter, which complicates their detection. However, thanks to recent theoretical, experimental, and observational progress these particles may be discovered or ruled out within the near future. I will review some of the recent ideas that may soon play a role in axion discovery, including computing the evolution of axions in the early universe using supercomputers and novel observational signatures of axions that emerge in extreme astrophysical environments such as supernovae. Date recorded: October 16, 2025 ================= Caltech PMA Website: http://pma.caltech.edu/​​​​ =================

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