Theory Seminar (High Energy/Cosmology)

<< Fall 2022 Spring 2023 Summer 2023 >>
Subscribe your calendar or receive email announcements of events

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
Add this event to your calendar

Thursday, March 30th, 2023

No events scheduled

Friday, March 31st, 2023

No events scheduled