Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Cosmic rays 6

T 83.7: Talk

Thursday, March 7, 2024, 17:30–17:45, Geb. 20.30: 2.059

Micromirror confinement of sub-TeV cosmic rays in galaxy clusters — •Patrick Reichherzer¹, Archie F. A. Bott¹, Robert J. Ewart¹, Gianluca Gregori¹, Philipp Kempski², Matthew W. Kunz², and Alexander A. Schekochihin¹ — ¹University of Oxford, UK — ²Princeton University, US

Recent observations reveal that cosmic rays (CRs) are more tightly confined in various astrophysical systems than current theories predict. We propose that microscale magnetic fluctuations, particularly from the mirror instability, significantly influence CR transport. Our theory is supported by simulations of CRs in the intracluster medium (ICM) of galaxy clusters. Our results indicate that sub-TeV CR confinement in the ICM is much more efficient than previously thought based on extrapolating existing Galactic-transport theories.

Keywords: Cosmic rays; transport; diffusion; confinement