Speaker
Description
The transport of cosmic rays (CRs) across galaxy clusters reflects a reciprocal interaction across plasma scales. Large-scale processes (≳kpc) typically influence microscale behavior (~npc), but we show that microscale fluctuations from the mirror instability—inherently patchy and intermittent in nature—shape large-scale radio morphologies in galaxy clusters by mediating CR propagation. Our multi-scale simulations (hybrid-kinetic to MHD) show a scale-dependent anomalous CR transport in this heterogeneous medium, for which we present a theoretical expression, with subdiffusion dominating at small scales and advection by turbulent motions taking over at larger scales. This interplay influences radio morphologies, revealing the significant macroscopic impact of microscale physics on CR transport.