Colloquium : Philipp Kempski
On Monday, January 27, from 14:00 to 15:00 (by zoom), Philipp Kempski (Department of Astrophysical Sciences, Princeton University, USA) will present a Colloquium as invitee of the scientific area of Plasmas Physics, Lasers and Nuclear Fusion.
Wave Goodbye: A New Picture of Cosmic Ray Propagation
Cosmic rays (CRs), relativistic charged particles that permeate the universe, play a crucial role in shaping a broad range of astrophysical phenomena, from the ionization of star-forming molecular clouds to the launching of galactic winds. As a result, CRs are a key ingredient in models of galaxy evolution and structure formation. However, despite many decades of work, the propagation of CRs through galactic magnetic fields remains a major open problem, severely limiting our ability to accurately simulate their impact on galaxies. In this talk, I will discuss a new model of CR transport, where particle scattering is primarily due to rare coherent magnetic structures, such as small-scale bends, rather than volume-filling waves, as assumed in long-standing propagation theories. I will support this idea with extremely high-resolution simulations of CR transport in magnetized turbulence, and I will discuss how these coherent interstellar structures can be probed observationally.
Link to zoom: https://videoconf-colibri.zoom.us/j/96228650362?pwd=CyaPThXY8o7TmcnXe3JtUjxsJUH8cw.1All are invited to attend