Theory Seminar (High Energy/Cosmology) |
Events During the Week of March 26th through April 2nd, 2023
Monday, March 27th, 2023
- No events scheduled
Tuesday, March 28th, 2023
- No events scheduled
Wednesday, March 29th, 2023
- Axion assisted Schwinger effect
- Time: 1:00 pm - 2:30 pm
- Place: 5280 Chamberlin
- Speaker: Yohei Ema, University of Minnesota
- Abstract: Particle production in strong electromagnetic fields, the Schwinger effect, is a recurring theme in solid state physics, heavy ion collisions, early universe cosmology and formal quantum field theory. In this talk, after reviewing the standard Schwinger effect, we show that the pair production rate of charged fermions in a strong electric field is enhanced in the presence of time dependent classical axion-like background field, which we call axion assisted Schwinger effect. While the standard Schwinger production rate is proportional to $\exp(−\pi(m^2+p^2_T)/E)$, with $m$ and $p_T$ denoting the fermion mass and its momentum transverse to the electric field $E$, the axion assisted Schwinger effect can be enhanced at large momenta to $\exp(−\pi m^2/E)$. We interpret the origin of this enhancement as a coupling between the fermion spin and its momentum, induced by the axion velocity.
- Host: George Wojcik
Thursday, March 30th, 2023
- No events scheduled
Friday, March 31st, 2023
- No events scheduled