Cosmic Ray Dynamics and Feedback in the Era of Multi-Messenger Astronomy

Cosmic rays (CRs) are relativistic particles that form a ubiquitous, high-energy plasma component across astrophysical and space environments. They shape the energy budget, ionization and chemistry, and non-thermal multi-wavelength/multi-messenger signatures of systems ranging from the heliosphere and planetary environments to star-forming regions, supernova remnants, galaxies, galaxy clusters, and cosmological filaments. Despite decades of progress, understanding their origins, acceleration mechanisms to relativistic energies, and subsequent interactions and propagation through magnetized plasmas remains a fundamental multi-scale challenge in modern astrophysics and space physics.This Research Topic aims to bring together current advances on CR transport, interactions, acceleration, and feedback across Galactic and extragalactic CRs, Solar Energetic Particles, and Anomalous Cosmic Rays, linking theory, simulation, and observations/in-situ measurements, and spanning scales from interstellar/intergalactic media to heliospheric, magnetospheric, and planetary settings. We seek to foster a comprehensive, interdisciplinary overview of the current state-of-the-art and to delineate critical future directions in the physics of cosmic ray acceleration, transport, interactions and feedback throughout the Universe. We welcome theoretical studies, advanced numerical modeling (MHD, kinetic, hybrid, test-particle, and data-driven approaches), and observational or in-situ analyses addressing, but not limited to, the following themes: • Transport and propagation: Parallel/perpendicular diffusion, pitch-angle scattering, adiabatic energy changes, advection with background flows, gradient/curvature drifts, magnetic mirroring, field-line wandering, intermittency, and heliospheric modulation• Acceleration mechanisms: Diffusive shock acceleration at astrophysical and heliospheric shocks, magnetic reconnection, second-order Fermi acceleration driven by turbulence, resonant interactions with plasma waves, and other non-thermal energization processes• Plasma coupling, turbulence, and self-confinement: The streaming instability, CR influence on shock structure, plasma heating, and pressure support; CR interplay with MHD/kinetic turbulence (generation, damping, and the modification of turbulent cascades)• Interactions, emission, and feedback: Hadronic/leptonic losses and secondary production, CR ionization and astrochemistry, multi-wavelength/multi-messenger diagnostics (radio to gamma-rays, and neutrinos), CR feedback on star formation, outflows/winds, galaxy evolution, and heliospheric structure.Submissions including original research articles, reviews/mini reviews, methods papers, brief research reports, and perspectives are welcomed. Topic editors: Ellis R. Owen, Ka Ho Yuen, Paula Chadwick Source: https://www.frontiersin.org/research-topics/77062/cosmic-ray-dynamics-and-feedback-in-the-era-of-multi-messenger-astronomy