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It is well known that an axion obtains a potential and thus a mass from strong dynamics in non-Abelian gauge theory. In the talk, I will show you that axions interacting with abelian gauge fields could also obtain a potential from loops of magnetic monopoles. This is a consequence of the Witten effect: the axion field causes the monopoles to acquire an electric charge and alters their energy spectrum. As a first step toward connecting with particle phenomenology and cosmology, I will discuss the regime in which this potential is important in determining the dark matter relic abundance in a hidden sector containing an abelian gauge group, monopoles, and axions.
Biography:
JiJi Fan is an Associate Professor of Physics at Brown University. She works on particle theories, in particular, beyond Standard Model theories such as Higgs phenomenology, supersymmetry, dark matter models and signatures. Her recent research is at the interface between elementary particle physics, astrophysics and cosmology. It combines both theoretical model building and numerical data analyses.Fan received her Ph. D degree in theoretical particle physics from Yale University in 2009. Then she worked as a postdoctoral researcher at Princeton University for three years and at Harvard University for one year. She moved to Brown University in 2015 as an assistant professor after spending two years as an assistant professor at Syracuse University.
Zoom meeting ID: 963579680-34
Passward: 125125
