Physics Department Colloquia |
Events During the Week of March 1st through March 8th, 2020
Monday, March 2nd, 2020
- No events scheduled
Tuesday, March 3rd, 2020
- No events scheduled
Wednesday, March 4th, 2020
- No events scheduled
Thursday, March 5th, 2020
- No events scheduled
Friday, March 6th, 2020
- Advances in Understanding Relativistic Plasma Turbulence
- Time: 3:30 pm
- Place: 2241 Chamberlin Hall
- Speaker: Vladimir Zhdankin, Princeton
- Abstract: Many distant high-energy astrophysical systems (such as pulsar wind nebulae, black-hole accretion flows, and jets from active galactic nuclei) contain collisionless plasmas that are relativistic, radiative, and highly nonthermal. Understanding the nature of turbulence in this extreme plasma physical regime and its implications for observations is an outstanding challenge in plasma astrophysics. Particle-in-cell (PIC) simulations have recently opened this topic to detailed, first-principles numerical and theoretical scrutiny. I will describe the latest progress on understanding relativistic kinetic turbulence. PIC simulations have demonstrated that relativistic turbulence is an efficient particle accelerator, joining the ranks of shocks and magnetic reconnection as a viable source of high-energy particles (and thus broadband radiation and cosmic rays). These simulations are now giving long-awaited tests for a line of analytic theories of stochastic particle acceleration originating with Enrico Fermi in 1949. Relativistic PIC simulations are also giving new insights into two-temperature electron-ion plasmas and radiative turbulence. The next several years promise to bring new breakthroughs into these problems.
- Host: Jan Egedal