ABSTRACT
Axion was first proposed as an elegant dynamical solution to the strong CP problem and can reproduce all properties of dark matter at large scales. Many axion theories predict that axions and photons can coherently convert into each other in a background magnetic field, a phenomenon commonly observed in a mixed two-level quantum system such as neutrino oscillations and nuclear spin processions. Similar to the nuclear magnetic resonance, we point out that a periodic (in time or in space) background magnetic field can significantly enhance the axion-photon conversion. We denote this resonance as the Axion-Magnetic Resonance (AMR).
In this talk, I will first give a quick overview of new ideas of axion searches in recent years. I will illustrate the theoretical and experimental challenges and how the new resonance can help us probe some uncharted territories of the axion theories as well as distinguishing different QCD axion models (KSVZ and DSFZ) while all being independent of the axion relic abundance or cosmological history.
BIOGRAPHY
Chen Sun received his PhD in theoretical high-energy physics from Virginia Tech, under the supervision of Prof. Tatsu Takeuchi. He then has worked as a postdoctoral fellow at Tel Aviv University, Los Alamos National Laboratory, and currently at the Abdus Salam International Centre for Theoretical Physics (ICTP). As a theorist, his main interest is new physics in high-energy physics and their low-energy signatures.
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