September 7, 2021

Speaker: Romain Teyssier (in-person)

Contact Information: romain.teyssier@uzh.ch

Title: Cosmic magnetism from a computational perspective

Abstract: I will present a recent numerical study on the generation and the amplification of magnetic fields in the Universe. Through cosmological simulations of galaxy formation, we have studied the Biermann battery process that drives microscopic current and creates weak fields both in the linear and in the non-linear regime of structure formation. The next step in this Cosmic Dynamo is a fast amplification of the field through a turbulent dynamo driven by strong galactic winds at high redshift. After quickly reviewing the basic processes governing the turbulent dynamo, I will present a numerical experiment of a fast turbulent dynamo in a dwarf galaxy, highlighting the need for high spatial resolution. Finally, I will present recent results on the cosmic history of the magnetic field in a Milky-Way-like galaxy, using for the small scale turbulent dynamo a subgrid model that can overcome these difficult resolution requirements.

Visitor's room: 134

Visit Schedule:

Wednesday (8 Sep 2021):

  • 10:00 a.m.:

  • 10:30 a.m.: Astro Coffee

  • 11:00 a.m.: SFIR Talk

  • 12:00 p.m.: Wunch (Peyton 033)

  • 2:00 p.m.: Chang-Goo Kim (103A)

  • 2:30 p.m.: Chris Bambic

  • 3:00 p.m.:

  • 3:30 p.m.: N/A

  • 4:00 p.m.: N/A

  • 4:30 p.m.: Roohi Dalal

  • 5:00 p.m.: Lachlan Lancaster (Peyton 032)

  • 5:30 p.m.:

  • 6:00 p.m.: DINNER WITH HOST - meet in Grand Central

Dinner Sign-up (students have priority; 8 MAX) - add your name here:

1. Speaker

2. Faculty host: Michael Strauss

3. Postdoc host: Chang-Goo Kim

4. Roohi Dalal (if it will be outdoors)

5. Oliver Philcox

6. Eric Moseley

7. Rodrigo Cordova

8. Ivanna Escala

NO MORE THAN 8 PEOPLE (otherwise it is very difficult to properly interact with the speaker)